The police are attempting to get the illiterate man to sign an admission of guilt without telling him what it says. They beat him, over and over, hook electrodes up to testicles and shock him, threaten to kill him, and threaten to go after his family. Early news accounts reported that the torture continued well beyond the end of the recording. After the tape ran out, the same deputies apparently repeatedly submerged the guy's head in a fish tank and a bath tub, threatening to drown him unless he confessed. This guy at worst was a small-time drug dealer. He had no history of violence.
The only reason this has been proved is because the victim's wife secretly recorded the torture session. Listen if you can bear it. The five cops are now mercifully in jail, but only for, at most, seven years. I guess when the president has endorsed torture by the CIA, it's hard to put low-level cop-torturers in jail for life. Radley believes this kind of atrocity is more common than we might believe. I have no way to know. What I do know is that when the government launches an ill-defined "war" on a "thing", rather than an explicit foreign enemy, and when you have an administration as profoundly hostile to American liberty as this one is, all sorts of abuses will necessarily follow. And they have.