(GMA.YAHOO) — A California high school student was shocked at what she found when she decided to play detective and stop a string of thefts from backpacks during gym class.

Justine Betti said she decided to hide in a locker to see if she could catch the thief in action. She didn’t expect the alleged culprit to be her gym teacher.

After all of the students left the locker room, the teacher stayed behind, rummaged through backpacks and took money, Betti said.

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