COLTON (CBSLA.com) — A 29-year-old middle school teacher accused of possessing heroin was arrested Tuesday at a Colton school on drug charges, authorities said.

Colton police told CBS2’s Tom Wait that a district employee had noticed suspicious behavior from the teacher in question before classes began on Tuesday, and alerted authorities.

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When police arrived to Jehue Middle School in Colton, they approached Kylie MacKenzie, who allegedly confessed to using a narcotic before school.

“Our officers did believe he was under the influence of a narcotic and he was determined to have heroin in his possession,” said Cpl. Ray Mendez of the Colton Police Department.

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Police say they then seized the heroin and placed MacKenzie under arrest.

“The kids have to have noticed. They’re older,” said Monica Solorzano, a parent. “My son is in eighth grade. He’s going to high school. With all this peer pressure going on, and then for a teacher to do it! That gets me so upset.”

According to school officials, MacKenzie has been put on paid administrative leave.

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MacKenzie is due in court on Thursday.