Test exercises have great value. They can be a learning experience for all involved. Weaknesses and breakdowns are identified in advance. Obviously, this example demonstrates the failure of communication. If you surprise people, whether employees or the public, problems will occur. Exercises need to be documented and planned.
Also, anyone looking for a Director of Security position at a hospital in LV? The article links back to the job posting
http://www.recruitingnevada.com/jobposting.aspx?ID=25c590d8-bc8c-442a-8e19-def31e386728