The last posting I read questioned why Colonial Williamsburg would institute mandatory drug testing. It is my understanding that mandatory drug testing is used heavily in organizations and companies dependent on interaction with the public (amusement/entertainment industry) or in situations where a drug user could place others at risk (testing laboratories, operating rooms, etc.). The attitudes of tour guides, role-playing actors, exhibit interpreters, and similar outreach staff is keenly important to an enjoyable (hence profitable and goodwill-producing) visit to places like Colonial Williamsburg, Disney World, Knotts Berry Farm, the Grand Canyon Visitor Center, etc. While I'm no fan of the testing, I can see why it would deemed important by administrators.