Casually mention the place is being staked out- good suggestion. Could say hey bro I'm a little uncomfortable here with the way the cops have been watching this place. Or I'd move. A snitch is good for nothing in my book. Karma is a bitch. Do you know if theyre selling heroin, meth or crack? Pot dealers usually have harmless customers compared to hard drugs. Say you call the cops and tip them off, these guys get busted and figure you for the one who informed the cops, they'll be out on bail the same day probably and things could get dangerous for you bro. I faced a 30 year bid once over some punk who wanted to be a big shot with the cops, there were no drugs involved. Later on the dude had a near fatal accident- what comes around goes around.