37 year-old Samuel Fawcett, a former school resource officer in Stevensville, was arrested on Wednesday and charged with sex crimes involving a minor child.
Ravalli County Attorney Bill Fulbright said the investigation began in April.
The charges came to light when the minor child was interviewed by First Step in Missoula, where it was revealed that the child had been touched inappropriately at school by a classmate. She told investigators that the defendant had also touched her in that way.