To verify:
jboss-head/testsuite ant tests-security-manager

org.jboss.test.securitymgr.test.MDBUnitTestCase deploys cts.jar but doesnt cleanup.
This causes the following tests to fail.
org.jboss.test.securitymgr.test.StatefulSessionUnitTestCase
org.jboss.test.securitymgr.test.StatelessSessionUnitTestCase
org.jboss.test.securitymgr.test.WebIntegrationUnitTestCase

with the following error:
org.jboss.deployment.DeploymentException: Trying to install an already registered mbean: jboss.mq.destination:service=Topic,name=testTopic
at org.jboss.system.ServiceCreator.install(ServiceCreator.java:103)
at org.jboss.system.ServiceConfigurator.internalInstall(ServiceConfigurator.java:449)
at org.jboss.system.ServiceConfigurator.install(ServiceConfigurator.java:171)
at org.jboss.system.ServiceController.install(ServiceController.java:226)

When org.jboss.test.securitymgr.test.MDBUnitTestCase is removed from the suite the above tests pass.

http://cruisecontrol.jboss.com/cc/artifacts/jboss-head-testsuite-1.5/20060601114748/results/index.html