Law & Order SVU Season 10 episode 14

In the 14th episode of the 10th season, the case of a beaten up man in a strippers parking lot takes a turn when they discover that he is a father of a trans teen, who does not accept that his boy is a girl. At first they think she did it, after confessing, however they discover that she was involved in a burglary involving medication for transition. They soon discover it was the school counselor that beat up the dad and on the stand, she admits to being trans herself and that she was beaten and mutilated by three men when she was younger. The DA decides that a lighter sentence is in order, due to the trauma. 

Law & Order: SVU