Be glad you didn't have this guy for a science teacher in school.

A Salem, Oregon science teacher has been charged with criminal mistreatment after using a Tesla coil that transmits electricity without wires at high frequency and high voltage levels to burn the phrase "I love mom" into the arms of students.

Samuel Dufner was arrested Tuesday at South Salem High School. Police say students were using the coil during an exercise on Thursday, April 30, when Dufner mentioned the coil could also be used for marking skin and asked for volunteers.

He evidently found a few takers, as Dufner burned "I love mom" with a heart to symbolize the word love - into their arms.

A parent of one of the students complained, which started the police investigation.

Dufner posted $2,000 bail. After that, the Salem-Keizer School District placed him on leave.

According to a representative from the Salem police, the markings on the burned students had mostly faded.

Source: KDLT TV

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