>> reporter: jiang, the police officer who fled china, describes in graphic detail methods of sexual torture that he says police officers used. >> translator: if you want people to confess, you use the electric baton. we would tie two electrical wires on the tips and set the wires on their genitals while the person is tied up. the result is better. >> reporter: he also says police sometimes ordered prisoners to sexually assault detainees. >> translator: we call it an in prison investigation. >> reporter: the chinese government insists it is battling violent extremism in xinjiang. beijing also denies any human rights abuses whatsoever are being committed there. >> translator: i want to reiterate the so-called genocide in xinjiang is nothing but a rumor backed by ulterior motives and outright lie. >> reporter: but jiang says he got double his normal salary to join tens of thousands of other police sent to xinjiang as part of the government crackdown.