RANCHO CUCAMONGA (CBSLA) — A teacher at Rancho Cucamonga High School has been placed on administrative leave after school administrators found out he kept a firearm inside his classroom.

The teacher, a reserve police officer, reportedly kept the firearm in a locked cabinet.

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The teacher’s friend Ashley Biering told CBSLA that school officials took his badge, service weapon, and have placed him on administrative leave.

The principal of the high school left a voicemail to parents informing them of the situation.

Mother Shekeytha Thompson said she doesn’t care that the teacher is a sworn officer with a concealed carry permit.

“I don’t think he should have it. What if a student gets into that cabinet?” said Thompson.

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Fabian Ojeda, a junior at the high school said, “You have that sense of protection, in a way.”

Biering says her friend is a hero and a fellow Route 91 Harvest Music Festival mass shooting survivor who carried an injured friend on his back for a mile.

The Chaffey Unified School District released a statement saying in part, “The teacher would not face any criminal penalty for carrying or possessing a firearm on school premises. Nonetheless, the district maintains a policy regulation that prohibits any employee, with the exception of the district’s Director of Safety and campus officers, from bringing firearms onto school premises.”

A Change.org petition was made in hopes to save the teacher’s 21-year teaching career.

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The petition has already accumulated almost 4,000 signatures.