Law & Order: Special Victims Unit: Season 6, Episode 11

Contagious

A medical exam of a nine-year-old girl (Jennette McCurdy) who survived a car accident with her parents reveals that she was a victim of sexual abuse. Out of fear and desperation, she ends up blaming the wrong suspect (Daniel Hugh Kelly), leading to a rash of false accusations against him by other girls. However the SVU finds out she was actually victimized by somebody much closer to the prime suspect.