South Park: Season 7, Episode 6 - ProjectFreeTV

7 - 6: Lil' Crime Stoppers

The boys play "junior detectives" to earn a little money. The boys solve the case of a missing doll, and the police are so impressed that they make the boys real detectives, assigning them to bust a meth lab. Meanwhile, poor Butters tries to provide a semen sample for evidence in a case.