I find wearing a sign around my neck that says "I have/buy drugs" and take a brisk walk around my neighborhood and see who comes out of the houses. If it's a swat team, investigators, or leo, then yes you're being watched. Sarcasm aside, if you're buying personal amounts, and keep all your shit well encrypted you should be alright. Paranoia, and fear won't help just keep you head together. ~Digi