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A measles outbreak delays arrests in a case involving pornographic photos taken by teens at a party. Meanwhile, Benson discovers that some kids' medical records may have been falsified after Noah gets measles; Amaro leans upsetting news about his son.
In Part 1 of the two-part 17th-season opener, the squad revisit a crime scene where bodies were buried by a serial killer. Rollins tries to get a confession, but the killer reveals shocking new info instead.