The guys that can't stop getting picked on have to 'check in' which means they are the ones who have to voluntarily go to the SHU (segregated housing unit or so

The guys that can't stop getting picked on have to 'check in' which means they are the ones who have to voluntarily go to the SHU (segregated housing unit or solitary) and do their entire sentence their until Obama passed a law limiting how long someone could be kept in the SHU, so now they get sent back to general population :( yay for good intentions.