That's awesome and has a lot of merit. Those guys are pretty much animals so simple things like color and sound can likely have a strong influence on them.

My biggest beef with prisoners is that they are in there for a reason, and yet they still insist on causing problems, being violent and uncooperative. That should not be tolerated. That scum bag saying he wanted to break the guys nose should have his balls removed. You act like an animal you should be treated like one. Too much sympathy for the devil these days...