Detectives Lennie Briscoe and Ed Green investigate the murder of a young boy, Aaron Polanski, who was found on a construction site with his trousers pulled down around his ankles and a AAA battery in his mouth. The medical examiner determines the boy died from a blow to the head but was not sexually assaulted. The police find two eyewitnesses to the crime, Tara Padden and Jenny Brandt - 13 and 10 years-old - but they soon begin to suspect they are lying. In fact, they come to believe they likely lured Aaron and killed him. Jenny seems to be the one who actually did the killing and after reviewing the facts, including Dr. Skoda's report, ADA McCoy wants the girl committed to a state mental hospital. The girl's lawyer counters with her own expert, Dr. Elizabeth Olivet, arguing the girl the girl can be treated outside of an institution.
—garykmcd