A science teacher in Salem, Oregon, is under fire for allegedly burning students with a Tesla coil, KRMG reports.

A prosecutor says he isn't filing criminal charges "at this time" against South Salem High School science teacher Samuel Dufner, who is accused of burning phrases like "I love mom" into students' arms. The students reportedly volunteered for the experiment.

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Dufner was arrested Tuesday at the school. He has been placed on leave.

The Tesla coil transmits electricity without wires at high frequency and high voltage levels.

Laurel Lee of WDBO in Orlando, Fla., contributed to this report.