i believe the second episode of the season Dutch was working a rape case. A prostitute was raped in the back of a grocery store and the joint was cuaght on tape by a security camera. Dutch was reviewing it to try to get an I.D. on the suspect or the victim. Acerveda tells dutch to make a copy to give to the DA. Acerveda takes the tape and watches it getting a hard on and decides to take the tape when he cleans out his office. This is how the show introduces that Acerveda is now into the whole rape thing.