It's easy to detect and lose a "tail". You run SDR's (surveillance detection routes). They teach this technique at "the Farm" (CIA clandestine training in Virginia) or you can learn it like I did by reading Tom Clancy and Brad Thor novels and watching the Jason Bourne movies.
Just like I learned to shoot by watching Spike Lee films. You know...hold gun sideways parallel to the ground and pull trigger as fast as possible. That and shoot a MAC10 in full auto with one hand. For this it helps to practice wrist curls with 10lb dumbbells.
