To the mods- This is a real world police procedure question not a TV show inquiry as such, but if you feel it need to be moved - move away.
Over the years, throughout the course of the NYPD Blue show one constant has always been Andy Sipowitz, and occasionally others including the female officers, slapping around or roughing up perps or suspects while officers look the other way. I know that a bunch of NYC cops beat up Abner Louima and got prosecuted for it, but NYPD Blue makes this behavior seem like SOP and Sipowitz never gets caught. Are police beatings to elicit confessions something police still do?
I can understand a policeman using force in a confrontation, but is a real world policeman allowed any use of physical force to elicit cooperation while the suspect is in custody?