An Indiana high school teacher was arrested Wednesday after students allegedly filmed her doing drugs in an empty classroom.

Students at Lake Central High School spotted English teacher Samantha Cox, 24, allegedly snorting what police believe to have been a mixture of cocaine and heroin, CBS News reports. The students went straight to the principal, who in turn called police. A drug-sniffing dog was brought in, and Cox was handcuffed and led out of the school around 1 p.m. Wednesday.

She now faces felony drug possession and misdemeanor paraphernalia charges.

John Rogers, the student who filmed Cox, said the teacher was in a corner of the empty classroom, trying to stay out of sight.

“She tried to hide herself. She wasn’t at her desk where we could see her. She was all the way in the corner where she thought we can’t see her.”

The video shows a woman sitting on a chair pushing a white powder into lines on a binder. She then gets up, turns her back to the camera, and leans over it.

St. John Chief James Kveton said the students who went to the principle to report Cox showed “a tremendous amount of fortitude and integrity” for their actions.

Michael Sanchez, another student at the high school, said it was sad to see someone doing drugs.

“It is like a serious thing. A lot of people can get addicted to a lot of things, and something like this is, it’s very heart-breaking.”

[Feature Photo: Lake County Sheriff’s Office]