This girl is a modern hero.

Students in a high school gym class kept noticing stuff missing from their backpacks. Justine Betti, a sophomore, set out to prove it by hiding in a locker.

Sure enough, her teacher soon began rifling through students’ bags and taking shit. And it was all captured on camera.

"I didn't want to believe that she would do something like that because she was so nice, but then she did it," Betti said.

The tape shows her teacher going through backpacks, with one clearly showing what appears to be money being taken from a pink backpack.

"I was like, oh my God, I can't believe I got this on video and I couldn't believe that I got it and I kept watching it over and over," she said.

Betti and several friends took the video to the principal.

"He said that he'll investigate it and he told us to delete the video but I had already sent it to my dad."

The sticky-fingered teacher has been placed on administrative leave but no criminal charges have been filed.

You can’t get away with anything, people. So don’t even try.

[H/T: News 10]