Watched I Remember Her Now from Trakt
The body of a 15-year-old girl is found crushed in an abandoned building after she runs away from a treatment center for troubled girls. Voight sends Halstead undercover as a guard to work from the inside at the center, where he believes the girls are trading sexual favors for something in return.

📺 watched Chicago P.D. 4×13 “I Remember Her Now” https://trakt.tv/shows/chicago-p-d/seasons/4/episodes/13