Hey man, anyone I know who does drugs knows the consequences for getting caught. And guess what. They are careful and don't get caught.
If I'm driving down the highway, where the speed limit is 70 mph, and i'm doing 90, I know I'm breaking the law. So if I get stopped and get a ticket, is the cop just being a bitch? No, the cop's doing their job upholding the law.
If a friend of mine got sent to jail, I'd be telling them how they fucked up and got caught. And probably trying to help them get through shit, and then either quit whatever they got thrown in for, or help them keep it more concealed.
You might hate 'em, but cops just have a job to do.