Gem

The team gets a tape of a snuff movie where a young girl is assassinated. They believe the tape was not tampered with and it's not a fake contrary to most snuff movies. They match the face of the girl on the tape to a missing girl report entered by Arlen Dallas. On instinct, Rebecca asks Carter to reconstruct the face of the girl at different ages. It is discovered that she has been spotted on hundreds of child pornography materials at different ages.

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S01E13 - Skin and Bone