From personal experience with police investigations... they aren't really all that inconspicuous when they come aspying. The van with tints several shades darker than the legal limit that sits outside and the trucks with dash-mount computers and racks of equipment visible through the windshield shadowing your every move aren't exactly hard to see if you're paying attention. When they've got telescopic lenses watching from an adjacent building, you can also see those with the naked eye if you look closely. Hopefully national spy agencies are better at it than small town drug task forces, but...
