Personally I think incarcerated individuals should all have their heads shaved regularly. 

This minimizes their "feelings of individuality" thus creating hierarchies, pecking orders, gangs, etc. 

If it's good enough for the military to "break down" individuals upon entering boot camp, then it's good enough for prisoners. Prison shouldn't be a rent free, three squares-a-day stay for chronics who, in many cases, CHOOSE to be there.