diff --git a/.zuul.yaml b/.zuul.yaml
index 62800aa..b1440a3 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -2,8 +2,8 @@
     name: patrole-base
     parent: devstack-tempest
     description: |
-       Patrole base job for admin and member roles. This job executes RBAC tests
-       for all the "core" services that Tempest covers, excluding Swift.
+      Patrole base job for admin and member roles. This job executes RBAC tests
+      for all the "core" services that Tempest covers, excluding Swift.
     required-projects:
       - name: openstack/tempest
       - name: openstack/patrole
@@ -139,16 +139,15 @@
     name: patrole-plugin-base
     parent: patrole-base
     description: |
-         Patrole plugin job for admin and member roles which
-         runs RBAC tests for neutron-tempest-plugin APIs (if the plugin is installed).
+      Patrole plugin job for admin and member roles which
+      runs RBAC tests for neutron-tempest-plugin APIs (if the plugin is installed).
     required-projects:
       - name: openstack/tempest
       - name: openstack/patrole
       - name: openstack/neutron-tempest-plugin
     vars:
       devstack_localrc:
-        TEMPEST_PLUGINS: "'/opt/stack/patrole
-                           /opt/stack/neutron-tempest-plugin'"
+        TEMPEST_PLUGINS: "'/opt/stack/patrole /opt/stack/neutron-tempest-plugin'"
       devstack_plugins:
         neutron: git://git.openstack.org/openstack/neutron.git
         patrole: git://git.openstack.org/openstack/patrole.git
@@ -178,7 +177,14 @@
 
 - project:
     templates:
+      - openstack-cover-jobs
+      - openstack-lower-constraints-jobs
       - openstack-python36-jobs
+      - openstack-python-jobs
+      - openstack-python35-jobs
+      - check-requirements
+      - publish-openstack-docs-pti
+      - release-notes-jobs-python3
     check:
       jobs:
         - patrole-admin
@@ -189,7 +195,6 @@
         - patrole-py35-member
         - patrole-multinode-admin
         - patrole-multinode-member
-        - openstack-tox-lower-constraints
         - patrole-plugin-admin
         - patrole-plugin-member
     gate:
diff --git a/patrole_tempest_plugin/rbac_exceptions.py b/patrole_tempest_plugin/rbac_exceptions.py
index 809a7ed..3958e17 100644
--- a/patrole_tempest_plugin/rbac_exceptions.py
+++ b/patrole_tempest_plugin/rbac_exceptions.py
@@ -16,12 +16,16 @@
 from tempest.lib import exceptions
 
 
-class RbacConflictingPolicies(exceptions.TempestException):
+class BasePatroleException(exceptions.TempestException):
+    message = "An unknown RBAC exception occurred"
+
+
+class RbacConflictingPolicies(BasePatroleException):
     message = ("Conflicting policies preventing this action from being "
                "performed.")
 
 
-class RbacMalformedResponse(exceptions.TempestException):
+class RbacMalformedResponse(BasePatroleException):
     message = ("The response body is missing the expected %(attribute)s due "
                "to policy enforcement failure.")
 
@@ -37,25 +41,25 @@
         super(RbacMalformedResponse, self).__init__(**kwargs)
 
 
-class RbacResourceSetupFailed(exceptions.TempestException):
+class RbacResourceSetupFailed(BasePatroleException):
     message = "RBAC resource setup failed"
 
 
-class RbacOverPermissionException(exceptions.TempestException):
+class RbacOverPermissionException(BasePatroleException):
     """Raised when the expected result is failure but the actual result is
     pass.
     """
     message = "Unauthorized action was allowed to be performed"
 
 
-class RbacUnderPermissionException(exceptions.TempestException):
+class RbacUnderPermissionException(BasePatroleException):
     """Raised when the expected result is pass but the actual result is
     failure.
     """
     message = "Authorized action was not allowed to be performed"
 
 
-class RbacExpectedWrongException(exceptions.TempestException):
+class RbacExpectedWrongException(BasePatroleException):
     """Raised when the expected exception does not match the actual exception
     raised, when both are instances of Forbidden or NotFound, indicating
     the test provides a wrong argument to `expected_error_codes`.
@@ -64,16 +68,30 @@
                "instead. Actual exception: %(exception)s")
 
 
-class RbacInvalidServiceException(exceptions.TempestException):
+class RbacInvalidServiceException(BasePatroleException):
     """Raised when an invalid service is passed to ``rbac_rule_validation``
     decorator.
     """
     message = "Attempted to test an invalid service"
 
 
-class RbacParsingException(exceptions.TempestException):
+class RbacParsingException(BasePatroleException):
     message = "Attempted to test an invalid policy file or action"
 
 
-class RbacInvalidErrorCode(exceptions.TempestException):
+class RbacInvalidErrorCode(BasePatroleException):
     message = "Unsupported error code passed in test"
+
+
+class RbacOverrideRoleException(BasePatroleException):
+    """Raised when override_role is used incorrectly or fails somehow.
+
+    Used for safeguarding against false positives that might occur when the
+    expected exception isn't raised inside the ``override_role`` context.
+    Specifically, when:
+
+    * ``override_role`` isn't called
+    * an exception is raised before ``override_role`` context
+    * an exception is raised after ``override_role`` context
+    """
+    message = "Override role failure or incorrect usage"
diff --git a/patrole_tempest_plugin/rbac_rule_validation.py b/patrole_tempest_plugin/rbac_rule_validation.py
index 32deb9f..a7927fc 100644
--- a/patrole_tempest_plugin/rbac_rule_validation.py
+++ b/patrole_tempest_plugin/rbac_rule_validation.py
@@ -180,6 +180,7 @@
             expected_exception, irregular_msg = _get_exception_type(
                 exp_error_code)
 
+            caught_exception = None
             test_status = 'Allowed'
 
             try:
@@ -193,13 +194,16 @@
                     LOG.error(msg)
             except (expected_exception,
                     rbac_exceptions.RbacConflictingPolicies,
-                    rbac_exceptions.RbacMalformedResponse) as e:
+                    rbac_exceptions.RbacMalformedResponse) as actual_exception:
+                caught_exception = actual_exception
                 test_status = 'Denied'
+
                 if irregular_msg:
                     LOG.warning(irregular_msg,
                                 test_func.__name__,
                                 ', '.join(rules),
                                 service)
+
                 if allowed:
                     msg = ("Role %s was not allowed to perform the following "
                            "actions: %s. Expected allowed actions: %s. "
@@ -209,8 +213,10 @@
                                sorted(disallowed_rules)))
                     LOG.error(msg)
                     raise rbac_exceptions.RbacUnderPermissionException(
-                        "%s Exception was: %s" % (msg, e))
+                        "%s Exception was: %s" % (msg, actual_exception))
             except Exception as actual_exception:
+                caught_exception = actual_exception
+
                 if _check_for_expected_mismatch_exception(expected_exception,
                                                           actual_exception):
                     LOG.error('Expected and actual exceptions do not match. '
@@ -249,6 +255,14 @@
                         "Allowed" if allowed else "Denied",
                         test_status)
 
+                # Sanity-check that ``override_role`` was called to eliminate
+                # false-positives and bad test flows resulting from exceptions
+                # getting raised too early, too late or not at all, within
+                # the scope of an RBAC test.
+                _validate_override_role_called(
+                    test_obj,
+                    actual_exception=caught_exception)
+
         return wrapper
     return decorator
 
@@ -389,7 +403,7 @@
         irregular_msg = ("NotFound exception was caught for test %s. Expected "
                          "policies which may have caused the error: %s. The "
                          "service %s throws a 404 instead of a 403, which is "
-                         "irregular.")
+                         "irregular")
     return expected_exception, irregular_msg
 
 
@@ -431,8 +445,63 @@
 
 def _check_for_expected_mismatch_exception(expected_exception,
                                            actual_exception):
+    """Checks that ``expected_exception`` matches ``actual_exception``.
+
+    Since Patrole must handle 403/404 it is important that the expected and
+    actual error codes match.
+
+    :param excepted_exception: Expected exception for test.
+    :param actual_exception: Actual exception raised by test.
+    :returns: True if match, else False.
+    :rtype: boolean
+    """
     permission_exceptions = (lib_exc.Forbidden, lib_exc.NotFound)
     if isinstance(actual_exception, permission_exceptions):
         if not isinstance(actual_exception, expected_exception.__class__):
             return True
     return False
+
+
+def _validate_override_role_called(test_obj, actual_exception):
+    """Validates that :func:`rbac_utils.RbacUtils.override_role` is called
+    during each Patrole test.
+
+    Useful for validating that the expected exception isn't raised too early
+    (before ``override_role`` call) or too late (after ``override_call``) or
+    at all (which is a bad test).
+
+    :param test_obj: An instance or subclass of ``tempest.test.BaseTestCase``.
+    :param actual_exception: Actual exception raised by test.
+    :raises RbacOverrideRoleException: If ``override_role`` isn't called, is
+        called too early, or is called too late.
+    """
+    called = test_obj._validate_override_role_called()
+    base_msg = ('This error is unrelated to RBAC and is due to either '
+                'an API or override role failure. Exception: %s' %
+                actual_exception)
+
+    if not called:
+        if actual_exception is not None:
+            msg = ('Caught exception (%s) but it was raised before the '
+                   '`override_role` context. ' % actual_exception.__class__)
+        else:
+            msg = 'Test missing required `override_role` call. '
+        msg += base_msg
+        LOG.error(msg)
+        raise rbac_exceptions.RbacOverrideRoleException(msg)
+    else:
+        exc_caught_in_ctx = test_obj._validate_override_role_caught_exc()
+        # This block is only executed if ``override_role`` is called. If
+        # an exception is raised and the exception wasn't raised in the
+        # ``override_role`` context and if the exception isn't a valid
+        # exception type (instance of ``BasePatroleException``), then this is
+        # a legitimate error.
+        if (not exc_caught_in_ctx and
+            actual_exception is not None and
+            not isinstance(actual_exception,
+                           rbac_exceptions.BasePatroleException)):
+            msg = ('Caught exception (%s) but it was raised after the '
+                   '`override_role` context. ' % actual_exception.__class__)
+            msg += base_msg
+            LOG.error(msg)
+            raise rbac_exceptions.RbacOverrideRoleException(msg)
diff --git a/patrole_tempest_plugin/rbac_utils.py b/patrole_tempest_plugin/rbac_utils.py
index 9a9f864..c928f40 100644
--- a/patrole_tempest_plugin/rbac_utils.py
+++ b/patrole_tempest_plugin/rbac_utils.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 from contextlib import contextmanager
+import sys
 import time
 
 from oslo_log import log as logging
@@ -95,11 +96,17 @@
                 # if the API call above threw an exception, any code below this
                 # point in the test is not executed.
         """
+        test_obj._set_override_role_called()
         self._override_role(test_obj, True)
         try:
             # Execute the test.
             yield
         finally:
+            # Check whether an exception was raised. If so, remember that
+            # for future validation.
+            exc = sys.exc_info()[0]
+            if exc is not None:
+                test_obj._set_override_role_caught_exc()
             # This code block is always executed, no matter the result of the
             # test. Automatically switch back to the admin role for test clean
             # up.
@@ -222,6 +229,11 @@
                 cls.setup_rbac_utils()
     """
 
+    # Shows if override_role was called.
+    __override_role_called = False
+    # Shows if exception raised during override_role.
+    __override_role_caught_exc = False
+
     @classmethod
     def get_auth_providers(cls):
         """Returns list of auth_providers used within test.
@@ -238,7 +250,7 @@
                                "deprecated and will be removed in the S "
                                "release. Patrole tests will always be enabled "
                                "following installation of the Patrole Tempest "
-                               "plugin. Use a regex to skip tests.")
+                               "plugin. Use a regex to skip tests")
             versionutils.report_deprecated_feature(LOG, deprecation_msg)
             raise cls.skipException(
                 'Patrole testing not enabled so skipping %s.' % cls.__name__)
@@ -247,6 +259,33 @@
     def setup_rbac_utils(cls):
         cls.rbac_utils = RbacUtils(cls)
 
+    def _set_override_role_called(self):
+        """Helper for tracking whether ``override_role`` was called."""
+        self.__override_role_called = True
+
+    def _set_override_role_caught_exc(self):
+        """Helper for tracking whether exception was thrown inside
+        ``override_role``.
+        """
+        self.__override_role_caught_exc = True
+
+    def _validate_override_role_called(self):
+        """Idempotently validate that ``override_role`` is called and reset
+        its value to False for sequential tests.
+        """
+        was_called = self.__override_role_called
+        self.__override_role_called = False
+        return was_called
+
+    def _validate_override_role_caught_exc(self):
+        """Idempotently validate that exception was caught inside
+        ``override_role``, so that, by process of elimination, it can be
+        determined whether one was thrown outside (which is invalid).
+        """
+        caught_exception = self.__override_role_caught_exc
+        self.__override_role_caught_exc = False
+        return caught_exception
+
 
 def is_admin():
     """Verifies whether the current test role equals the admin role.
diff --git a/patrole_tempest_plugin/tests/api/compute/rbac_base.py b/patrole_tempest_plugin/tests/api/compute/rbac_base.py
index 18d2f48..99137cc 100644
--- a/patrole_tempest_plugin/tests/api/compute/rbac_base.py
+++ b/patrole_tempest_plugin/tests/api/compute/rbac_base.py
@@ -12,14 +12,11 @@
 #    under the License.
 
 from tempest.api.compute import base as compute_base
-from tempest import config
 from tempest.lib.common.utils import data_utils
 from tempest.lib.common.utils import test_utils
 
 from patrole_tempest_plugin import rbac_utils
 
-CONF = config.CONF
-
 
 class BaseV2ComputeRbacTest(rbac_utils.RbacUtilsMixin,
                             compute_base.BaseV2ComputeTest):
diff --git a/patrole_tempest_plugin/tests/api/identity/rbac_base.py b/patrole_tempest_plugin/tests/api/identity/rbac_base.py
index 91b3d1e..d34caaa 100644
--- a/patrole_tempest_plugin/tests/api/identity/rbac_base.py
+++ b/patrole_tempest_plugin/tests/api/identity/rbac_base.py
@@ -16,13 +16,11 @@
 from oslo_log import log as logging
 
 from tempest.api.identity import base
-from tempest import config
 from tempest.lib.common.utils import data_utils
 from tempest.lib.common.utils import test_utils
 
 from patrole_tempest_plugin import rbac_utils
 
-CONF = config.CONF
 LOG = logging.getLogger(__name__)
 
 
diff --git a/patrole_tempest_plugin/tests/api/identity/v3/test_tokens_negative_rbac.py b/patrole_tempest_plugin/tests/api/identity/v3/test_tokens_negative_rbac.py
index 00d522c..da5d4cd 100644
--- a/patrole_tempest_plugin/tests/api/identity/v3/test_tokens_negative_rbac.py
+++ b/patrole_tempest_plugin/tests/api/identity/v3/test_tokens_negative_rbac.py
@@ -13,7 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest import config
 from tempest.lib import decorators
 from tempest.lib import exceptions as lib_exc
 
@@ -21,8 +20,6 @@
 from patrole_tempest_plugin import rbac_utils
 from patrole_tempest_plugin.tests.api.identity import rbac_base
 
-CONF = config.CONF
-
 
 class IdentityTokenV3RbacTest(rbac_base.BaseIdentityV3RbacTest):
 
diff --git a/patrole_tempest_plugin/tests/api/image/rbac_base.py b/patrole_tempest_plugin/tests/api/image/rbac_base.py
index 954790d..2220335 100644
--- a/patrole_tempest_plugin/tests/api/image/rbac_base.py
+++ b/patrole_tempest_plugin/tests/api/image/rbac_base.py
@@ -12,12 +12,9 @@
 #    under the License.
 
 from tempest.api.image import base as image_base
-from tempest import config
 
 from patrole_tempest_plugin import rbac_utils
 
-CONF = config.CONF
-
 
 class BaseV2ImageRbacTest(rbac_utils.RbacUtilsMixin,
                           image_base.BaseV2ImageTest):
diff --git a/patrole_tempest_plugin/tests/api/network/rbac_base.py b/patrole_tempest_plugin/tests/api/network/rbac_base.py
index 9d3e28b..39ad311 100644
--- a/patrole_tempest_plugin/tests/api/network/rbac_base.py
+++ b/patrole_tempest_plugin/tests/api/network/rbac_base.py
@@ -14,12 +14,9 @@
 #    under the License.
 
 from tempest.api.network import base as network_base
-from tempest import config
 
 from patrole_tempest_plugin import rbac_utils
 
-CONF = config.CONF
-
 
 class BaseNetworkRbacTest(rbac_utils.RbacUtilsMixin,
                           network_base.BaseNetworkTest):
diff --git a/patrole_tempest_plugin/tests/api/volume/rbac_base.py b/patrole_tempest_plugin/tests/api/volume/rbac_base.py
index bac173e..8fa3b67 100644
--- a/patrole_tempest_plugin/tests/api/volume/rbac_base.py
+++ b/patrole_tempest_plugin/tests/api/volume/rbac_base.py
@@ -13,14 +13,11 @@
 
 from tempest.api.volume import base as vol_base
 from tempest.common import waiters
-from tempest import config
 from tempest.lib.common.utils import data_utils
 from tempest.lib.common.utils import test_utils
 
 from patrole_tempest_plugin import rbac_utils
 
-CONF = config.CONF
-
 
 class BaseVolumeRbacTest(rbac_utils.RbacUtilsMixin,
                          vol_base.BaseVolumeTest):
diff --git a/patrole_tempest_plugin/tests/unit/fixtures.py b/patrole_tempest_plugin/tests/unit/fixtures.py
index 1c47985..4552224 100644
--- a/patrole_tempest_plugin/tests/unit/fixtures.py
+++ b/patrole_tempest_plugin/tests/unit/fixtures.py
@@ -16,6 +16,7 @@
 """Fixtures for Patrole tests."""
 from __future__ import absolute_import
 
+from contextlib import contextmanager
 import fixtures
 import mock
 import time
@@ -117,6 +118,17 @@
             new_role = 'member' if role_toggle else 'admin'
             self.set_roles(['admin', 'member'], [new_role])
 
+    @contextmanager
+    def real_override_role(self, test_obj):
+        """Actual call to ``override_role``.
+
+        Useful for ensuring all the necessary mocks are performed before
+        the method in question is called.
+        """
+        _rbac_utils = rbac_utils.RbacUtils(test_obj)
+        with _rbac_utils.override_role(test_obj):
+            yield
+
     def set_roles(self, roles, roles_on_project=None):
         """Set the list of available roles in the system.
 
diff --git a/patrole_tempest_plugin/tests/unit/test_rbac_rule_validation.py b/patrole_tempest_plugin/tests/unit/test_rbac_rule_validation.py
index 1bf5510..fe36f2c 100644
--- a/patrole_tempest_plugin/tests/unit/test_rbac_rule_validation.py
+++ b/patrole_tempest_plugin/tests/unit/test_rbac_rule_validation.py
@@ -12,9 +12,12 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from __future__ import absolute_import
+
 import mock
 from oslo_config import cfg
 
+import fixtures
 from tempest.lib import exceptions
 from tempest import manager
 from tempest import test
@@ -23,7 +26,7 @@
 from patrole_tempest_plugin import rbac_exceptions
 from patrole_tempest_plugin import rbac_rule_validation as rbac_rv
 from patrole_tempest_plugin import rbac_utils
-from patrole_tempest_plugin.tests.unit import fixtures
+from patrole_tempest_plugin.tests.unit import fixtures as patrole_fixtures
 
 CONF = cfg.CONF
 
@@ -43,10 +46,12 @@
         setattr(self.mock_test_args.os_primary, 'credentials', mock_creds)
 
         self.useFixture(
-            fixtures.ConfPatcher(rbac_test_role='Member', group='patrole'))
+            patrole_fixtures.ConfPatcher(rbac_test_role='Member',
+                                         group='patrole'))
         # Disable patrole log for unit tests.
         self.useFixture(
-            fixtures.ConfPatcher(enable_reporting=False, group='patrole_log'))
+            patrole_fixtures.ConfPatcher(enable_reporting=False,
+                                         group='patrole_log'))
 
 
 class RBACRuleValidationTest(BaseRBACRuleValidationTest):
@@ -54,6 +59,12 @@
     ``rbac_rule_validation`` decorator.
     """
 
+    def setUp(self):
+        super(RBACRuleValidationTest, self).setUp()
+        # This behavior is tested in separate test class below.
+        self.useFixture(fixtures.MockPatchObject(
+            rbac_rv, '_validate_override_role_called'))
+
     @mock.patch.object(rbac_rv, 'LOG', autospec=True)
     @mock.patch.object(rbac_rv, 'policy_authority', autospec=True)
     def test_rule_validation_have_permission_no_exc(self, mock_authority,
@@ -269,7 +280,7 @@
             mock_log.warning.assert_called_with(
                 "NotFound exception was caught for test %s. Expected policies "
                 "which may have caused the error: %s. The service %s throws a "
-                "404 instead of a 403, which is irregular.",
+                "404 instead of a 403, which is irregular",
                 test_policy.__name__,
                 ', '.join(policy_names),
                 mock.sentinel.service)
@@ -334,7 +345,7 @@
         expected_irregular_msg = (
             "NotFound exception was caught for test %s. Expected policies "
             "which may have caused the error: %s. The service %s throws a "
-            "404 instead of a 403, which is irregular.")
+            "404 instead of a 403, which is irregular")
 
         actual_exception, actual_irregular_msg = \
             rbac_rv._get_exception_type(404)
@@ -385,6 +396,12 @@
     Patrole RBAC validation work flows.
     """
 
+    def setUp(self):
+        super(RBACRuleValidationLoggingTest, self).setUp()
+        # This behavior is tested in separate test class below.
+        self.useFixture(fixtures.MockPatchObject(
+            rbac_rv, '_validate_override_role_called'))
+
     @mock.patch.object(rbac_rv, 'RBACLOG', autospec=True)
     @mock.patch.object(rbac_rv, 'policy_authority', autospec=True)
     def test_rbac_report_logging_disabled(self, mock_authority, mock_rbaclog):
@@ -392,7 +409,8 @@
         is False
         """
         self.useFixture(
-            fixtures.ConfPatcher(enable_reporting=False, group='patrole_log'))
+            patrole_fixtures.ConfPatcher(enable_reporting=False,
+                                         group='patrole_log'))
 
         mock_authority.PolicyAuthority.return_value.allowed.return_value = True
 
@@ -410,7 +428,8 @@
         True
         """
         self.useFixture(
-            fixtures.ConfPatcher(enable_reporting=True, group='patrole_log'))
+            patrole_fixtures.ConfPatcher(enable_reporting=True,
+                                         group='patrole_log'))
 
         mock_authority.PolicyAuthority.return_value.allowed.return_value = True
         policy_names = ['foo:bar', 'baz:qux']
@@ -432,6 +451,12 @@
 
 class RBACRuleValidationNegativeTest(BaseRBACRuleValidationTest):
 
+    def setUp(self):
+        super(RBACRuleValidationNegativeTest, self).setUp()
+        # This behavior is tested in separate test class below.
+        self.useFixture(fixtures.MockPatchObject(
+            rbac_rv, '_validate_override_role_called'))
+
     @mock.patch.object(rbac_rv, 'policy_authority', autospec=True)
     def test_rule_validation_invalid_service_raises_exc(self, mock_authority):
         """Test that invalid service raises the appropriate exception."""
@@ -451,6 +476,12 @@
     ``rbac_rule_validation`` decorator.
     """
 
+    def setUp(self):
+        super(RBACRuleValidationTestMultiPolicy, self).setUp()
+        # This behavior is tested in separate test class below.
+        self.useFixture(fixtures.MockPatchObject(
+            rbac_rv, '_validate_override_role_called'))
+
     def _assert_policy_authority_called_with(self, rules, mock_authority):
         m_authority = mock_authority.PolicyAuthority.return_value
         m_authority.allowed.assert_has_calls([
@@ -708,3 +739,189 @@
         # When expected_error_codes is provided rules must be as well.
         self.assertRaisesRegex(ValueError, error_re, _do_test,
                                None, None, None, [404])
+
+
+class RBACOverrideRoleValidationTest(BaseRBACRuleValidationTest):
+    """Class for validating that untimely exceptions (outside
+    ``override_role`` is called) result in test failures.
+
+    This regression tests false positives caused by test exceptions matching
+    the expected exception before or after the ``override_role`` context is
+    called. Also tests case where ``override_role`` is never called which is
+    an invalid Patrole test.
+
+    """
+
+    def setUp(self):
+        super(RBACOverrideRoleValidationTest, self).setUp()
+
+        # Mixin automatically initializes __override_role_called to False.
+        class FakeRbacTest(rbac_utils.RbacUtilsMixin, test.BaseTestCase):
+            def runTest(self):
+                pass
+
+        # Stub out problematic function calls.
+        FakeRbacTest.os_primary = mock.Mock(spec=manager.Manager)
+        FakeRbacTest.rbac_utils = self.useFixture(
+            patrole_fixtures.RbacUtilsFixture())
+        mock_creds = mock.Mock(user_id=mock.sentinel.user_id,
+                               project_id=mock.sentinel.project_id)
+        setattr(FakeRbacTest.os_primary, 'credentials', mock_creds)
+        setattr(FakeRbacTest.os_primary, 'auth_provider', mock.Mock())
+
+        self.parent_class = FakeRbacTest
+
+    @mock.patch.object(rbac_rv, 'policy_authority', autospec=True)
+    def test_rule_validation_override_role_called_inside_ctx(self,
+                                                             mock_authority):
+        """Test success case when the expected exception is raised within the
+        override_role context.
+        """
+        mock_authority.PolicyAuthority.return_value.allowed.return_value =\
+            False
+
+        class ChildRbacTest(self.parent_class):
+
+            @rbac_rv.action(mock.sentinel.service, rules=["fake:rule"],
+                            expected_error_codes=[404])
+            def test_called(self_):
+                with self_.rbac_utils.real_override_role(self_):
+                    raise exceptions.NotFound()
+
+        child_test = ChildRbacTest()
+        child_test.test_called()
+
+    @mock.patch.object(rbac_rv, 'policy_authority', autospec=True)
+    def test_rule_validation_override_role_patrole_exception_ignored(
+            self, mock_authority):
+        """Test success case where Patrole exception is raised (which is
+        valid in case of e.g. RbacMalformedException) after override_role
+        passes.
+        """
+        mock_authority.PolicyAuthority.return_value.allowed.return_value =\
+            True
+
+        class ChildRbacTest(self.parent_class):
+
+            @rbac_rv.action(mock.sentinel.service, rules=["fake:rule"],
+                            expected_error_codes=[404])
+            def test_called(self_):
+                with self_.rbac_utils.real_override_role(self_):
+                    pass
+                # Instances of BasePatroleException don't count as they are
+                # part of the validation work flow.
+                raise rbac_exceptions.BasePatroleException()
+
+        child_test = ChildRbacTest()
+        self.assertRaises(rbac_exceptions.BasePatroleException,
+                          child_test.test_called)
+
+    @mock.patch.object(rbac_rv, 'policy_authority', autospec=True)
+    def test_rule_validation_override_role_called_before_ctx(self,
+                                                             mock_authority):
+        """Test failure case when an exception that happens before
+        ``override_role`` context, even if it is the expected exception,
+        raises ``RbacOverrideRoleException``.
+        """
+        mock_authority.PolicyAuthority.return_value.allowed.return_value =\
+            False
+
+        # This behavior should work for supported (NotFound/Forbidden) and
+        # miscellaneous exceptions alike.
+        for exception_type in (exceptions.NotFound,
+                               Exception):
+            class ChildRbacTest(self.parent_class):
+
+                @rbac_rv.action(mock.sentinel.service, rules=["fake:rule"],
+                                expected_error_codes=[404])
+                def test_called_before(self_):
+                    raise exception_type()
+
+            child_test = ChildRbacTest()
+            test_re = ".*before.*"
+            self.assertRaisesRegex(rbac_exceptions.RbacOverrideRoleException,
+                                   test_re, child_test.test_called_before)
+
+    @mock.patch.object(rbac_rv, 'policy_authority', autospec=True)
+    def test_rule_validation_override_role_called_after_ctx(self,
+                                                            mock_authority):
+        """Test failure case when an exception that happens before
+        ``override_role`` context, even if it is the expected exception,
+        raises ``RbacOverrideRoleException``.
+        """
+        mock_authority.PolicyAuthority.return_value.allowed.return_value =\
+            False
+
+        # This behavior should work for supported (NotFound/Forbidden) and
+        # miscellaneous exceptions alike.
+        for exception_type in (exceptions.NotFound,
+                               Exception):
+            class ChildRbacTest(self.parent_class):
+
+                @rbac_rv.action(mock.sentinel.service, rules=["fake:rule"],
+                                expected_error_codes=[404])
+                def test_called_after(self_):
+                    with self_.rbac_utils.real_override_role(self_):
+                        pass
+                    # Simulates a test tearDown failure or some such.
+                    raise exception_type()
+
+            child_test = ChildRbacTest()
+            test_re = ".*after.*"
+            self.assertRaisesRegex(rbac_exceptions.RbacOverrideRoleException,
+                                   test_re, child_test.test_called_after)
+
+    @mock.patch.object(rbac_rv, 'policy_authority', autospec=True)
+    def test_rule_validation_override_role_never_called(self, mock_authority):
+        """Test failure case where override_role is **never** called."""
+        mock_authority.PolicyAuthority.return_value.allowed.return_value =\
+            False
+
+        class ChildRbacTest(self.parent_class):
+
+            @rbac_rv.action(mock.sentinel.service, rules=["fake:rule"],
+                            expected_error_codes=[404])
+            def test_never_called(self_):
+                pass
+
+        child_test = ChildRbacTest()
+        test_re = ".*missing required `override_role` call.*"
+        self.assertRaisesRegex(rbac_exceptions.RbacOverrideRoleException,
+                               test_re, child_test.test_never_called)
+
+    @mock.patch.object(rbac_rv, 'policy_authority', autospec=True)
+    def test_rule_validation_override_role_sequential_test_calls(
+            self, mock_authority):
+        """Test success/failure scenarios above across sequential test calls.
+        """
+        mock_authority.PolicyAuthority.return_value.allowed.return_value =\
+            False
+
+        class ChildRbacTest(self.parent_class):
+
+            @rbac_rv.action(mock.sentinel.service, rules=["fake:rule1"],
+                            expected_error_codes=[404])
+            def test_called(self_):
+                with self_.rbac_utils.real_override_role(self_):
+                    raise exceptions.NotFound()
+
+            @rbac_rv.action(mock.sentinel.service, rules=["fake:rule2"],
+                            expected_error_codes=[404])
+            def test_called_before(self_):
+                raise exceptions.NotFound()
+
+        test_re = ".*before.*"
+
+        # Test case where override role is called in first test but *not* in
+        # second test.
+        child_test1 = ChildRbacTest()
+        child_test1.test_called()
+        self.assertRaisesRegex(rbac_exceptions.RbacOverrideRoleException,
+                               test_re, child_test1.test_called_before)
+
+        # Test case where override role is *not* called in first test but is
+        # in second test.
+        child_test2 = ChildRbacTest()
+        self.assertRaisesRegex(rbac_exceptions.RbacOverrideRoleException,
+                               test_re, child_test2.test_called_before)
+        child_test2.test_called()
diff --git a/releasenotes/notes/check-expected-errors-only-in-override-role-f7109a73f5ff70e2.yaml b/releasenotes/notes/check-expected-errors-only-in-override-role-f7109a73f5ff70e2.yaml
new file mode 100644
index 0000000..e0ac744
--- /dev/null
+++ b/releasenotes/notes/check-expected-errors-only-in-override-role-f7109a73f5ff70e2.yaml
@@ -0,0 +1,19 @@
+---
+features:
+  - |
+    Add new exception called ``RbacOverrideRoleException``. Used for
+    safeguarding against false positives that might occur when the expected
+    exception isn't raised inside the ``override_role`` context. Specifically,
+    when:
+
+    * ``override_role`` isn't called
+    * an exception is raised before ``override_role`` context
+    * an exception is raised after ``override_role`` context
+fixes:
+  - |
+    Previously, the ``rbac_rule_validation.action`` decorator could catch
+    expected exceptions with no regard to where the error happened. Such
+    behavior could cause false-positive results. To prevent this from
+    happening from now on, if an exception happens outside of the
+    ``override_role`` context, it will cause
+    ``rbac_exceptions.RbacOverrideRoleException`` to be raised.