Law and Order : SVU - Episode 9.15 - Undercover

THE RAPE OF A YOUNG WOMAN AND A STOLEN RAPE KIT PROMPTS DETECTIVE OLIVIA BENSON (MARISKA HARGITAY) TO GO UNDERCOVER IN PRISON.
When Ashley Tyler (guest star Shareeka Epps) is found raped and beaten in a local community garden, Detectives Olivia Benson (Mariska Hargitay) and Elliot Stabler (Christopher Meloni) initially suspect her drug-dealing uncle, Rick Tyler (guest star Hassan Johnson). After the rape kit identifying the rapist goes missing, a crooked prison guard comes under suspicion. Detective Benson puts herself in great danger as she goes undercover as a prison inmate to catch the predator. Also starring: Adam Beach, Dann Florek, Ice-T, Diane Neal, Tamara Tunie, Richard Belzer, and BD Wong.

Source: NBC