Drug folks raise them and then when they get mean or do something to the drug family often they take them out and just let them go.
Actually, in the ghetto culture, the first thing they do with a puppy Pitbull (especially if they're involved in drug dealing, but even absent that factor) is to set about "making them mean." They have a whole procedure for this, involving staking them down by a rope or chain and having buddies from other neighborhoods come by and strike the dog with a broom from time to time. When the dog finally gets enough of it and drives aggressively towards them in an effort to bite, the agitator runs away in pretended terror and leaves. This does two things: firstly it teaches the dog that most strangers will try to hurt them, given the chance, and secondly, that aggression towards said strangers is the solution. Pitbulls trained this way are unsafe around anyone but their owners, and not even completely with them. Pitbulls raised as family pets, on the other hand, typically have the attitude of never having met a stranger, i.e., they want to be friends with everyone they're introduced to, and most that they haven't been introduced to, also.
