The subject of prisons is a very delicate matter in the United States. This is due to the inefficient justice system which has the tendency to put individuals found guilty of illicit substances charges for many years, while those with serious crimes with another human as a victim may get less years.
Regardless, in the prisons meant for individuals with serious offenses, there is a strange hierarchy. The prisoners are controlled by the guards only if they want to be controlled. These individuals have nothing to lose, and many of these prisons are full of degeneracy. Guards cannot be forceful like the older times for humane reasons, and thus prisons have become a nonstop struggle between inmates and guards. Of course, corruption changes this dynamic.