When I worked as a fueler at the local airport, the FBI had(and still has) a hangar with a fleet of Cessnas, the biggest being a C-208. This article is very accurate about the equipment. We'd fuel them up during the week and off they went to spy, but the weekends were for football and beer, so no flying then. The pilots were always friendly and would get chatty and let us wide eyed fuel boys in on their little secret airplanes. Now I'm a bit older, a bit more grizzled and cynical. My work allows me a small window into that world and you'd be surpised of all the law enforcement equipent in our skies. Local small police and sheriff departments run Cessnas with some amazing equipment onboard in addition to the helicopters, major cities like L.A. have huge fleets and have no issue with hovering right up to your window and destroy your night with that billion watt lamp(happened to me more than once). Federal level has Airvans, tricked out Blackhawks, Bell 412s, you name it.