Take a tour of your building on campus or at work. What is secured at night when workers are absent? Record the location and type of physical access control devices. How do these access controls change at night when workers are absent? How well trained do guards and other employees appear to be? Do they allow piggybacking (somebody slipping into a facility behind an authorized individual without being challenged)? What are the polices for visitors and contractors? How does this all impact physical security?