The guy is an adult...exactly why he shouldn't be selling from his mothers home. If she is the owner of the house his consent doesn't mean shit. Same reason you need to be careful in a rented home. Once the landlord says it's ok your pretty much done for. Like JJscorp said, they had a warrant because he sold to a god dam undercover. Believe it or not most cops aren't as stupid as you might think. They are going to cover their asses 99 percent of the time, and they have alot more ways to cover things up than you. Also, did you recieve any charges? And if not, why are you trying to go after the police? Sounds to me like you should let your buddy deal with his own problems.