[Lawmaker]

http://en.wikipedia.org/wiki/Federal_Protective_Service_(United_States)

"currently employs approximately 750 federal law enforcement officer/inspectors, and special agents, that provide integrated security and law enforcement services to U.S. Federal buildings, courthouses, and other properties administered by the General Services Administration (GSA) and the U.S. Department of Homeland Security (DHS)."

So you saw the 1 out of 750 in the US. Me, never have seen one.