Frankly no, not much about rehabilitation. I worked in a couple of stockades while in the US Army. I really used to get disgusted when parents came to visit their sons and told me to be sure and make them do right. Really? Parents had them for 18 or 19 years, and either wouldn't or couldn't train them to do right. By the time we got them, they were usually very well set in their ways. Why would parents think that if we didn't have them for at least the same 18 - 19 years we had any chance for rehabilitation.
Before you think me too negative, let me tell you that in my short experience, the only ones you can really rehabilitate are those who sincerely want to rehabilitate themselves. They are easy to spot and differentiate from those who only say so for any favors they may get.
Some have mentioned not teaching boxing. I think it used to be common. Fraught with danger. It may be oped to give them something to do other than getting into trouble. Problem is it may make them a better trained fighter for when they decide to get into trouble.
But help rehabilitate them? Not unless they want it.
A History of Boxers Doing Jail BidsIntro