Entering a federal building or places where there are federal services is like going to the airport -- you have to go through security. Visitors are required to show photo identification and wear a badge while in the building. The identification can be any state or federal identification that has an issue and expiration date.
Security is operated by the Department of Homeland Security's Federal Protective Service.
All persons and their belongings, like purses, cell phones and computers, have to go through scanners. To make the process go faster, the FPS recommends that visitors empty their pockets before entering the building and wear shoes that do not contain metal. Prohibited items include medical marijuana and any knife with a blade longer than two and a half inches. Also people with a state-issued permit to carry a concealed weapon may not bring their firearm or ammunition into a federal building.