Barely out of college, 24-year-old high school teacher Samantha Cox has disgraced herself at Lake Central High School in St. John, Indiana, after students caught her on camera snorting lines of a drug in her classroom behind a locked door.

The student witnesses contacted school administrators, who called St. John police, who then requested a drug-sniffing dog from another department.

Cox was arrested at the school around 1 p.m. Wednesday. She now faces felony drug possession and misdemeanor paraphernalia charges and is being held in the Lake County Jail.

High school student John Rogers says he recorded cellphone video of Cox, his English teacher, snorting what police say may have been a mixture of cocaine and heroin.

“She tried to hide herself,” Rogers told CBS reporter Charlie De Mar. “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.”

Another student, Michael Sanchez, added, “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.”

St. John Chief James Kveton put out a statement saying the students showed a “tremendous amount of fortitude and integrity” by going directly to the principal.

In a robocall to parents, Lake Central Superintendent Larry Veracco said police and school staff took “swift and forceful action.” He noted that safety “remains the top priority of our school staff.”

Video of the woman allegedly snorting the lines in a corner of an empty classroom (see below) was posted to social media.