They did that in Camden I believe. You got less crime ("I was right!" you say) and more complaints about police violence, more altercations ("Oh no! I wasted 10 years!" says you if you tried it). It turns out that freshman police are really gung ho and more likely to chase criminals down and beat them up, while veterans are more likely to sit back and wait for backup. If your problem was the police acting violent with impunity, then this doesn't solve the problem. You can punish them, and then you are at square one again.