So as a swan song episode for Benson.
A serial rapist/murderer is caught and imprisoned for a rape in a non-NY state, but the M.O. is similar to an NYC case. Evidence links the rapist to the NYC case, but it is all tainted by the NYC crime lab, or by the FBI crime lab - lab experts stating soil samples and fiber matches are more certain than they are, DNA being improperly stored or collected. The forensics are thrown out, and SVU is basically SOL. They decide to call the victim from the other state to the stand, but she refuses. He's already been imprisoned for her case, and she strongly opposes her testimony being used to say "he's a bad guy - we can't convict him on the basis of what he did to our NYC girl, but convict him based on what he's done to this victim).
Benson loses it, keeps coming back after this woman to try and convince her to testify, to the point that the non-NY victim files a complaint for harassment. Stone subpoenas the woman, which she moves to quash. In the testimony, the victim makes a strong statement that she has to continue to believe in the system even when it doesn't work, because of cases like Emmett Till and the Scottsboro boys. She also says that if every aspect of her life were about rape, if every ethical decision was about rape, then she'd never be anything but a victim, and that she'd lose all perspective. You get a closing shot where Fin and Carisi and Stone look at Benson, and realize that there isn't anything in her life that wasn't about sexual assault somehow and that Benson has lost touch with the world outside sexual assault to a point where it's unhealthy. Cue them talking to her and or One PP about her needing to transfer to a different squad or take a leave.