Law & Order: Special Victims Unit: Season 1, Episode 19

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After seven young women in a six-month time span are raped by a flash and dash assailant on the city subways, the brass calls in a psychiatrist to help the team get into the head of the perp. When he is caught, all seven victims identify him in a police lineup, but the IDs are suppressed. However, the detectives find that he possesses the driver's license of a new victim who could put him away.