A man charged with child sex crimes was hired as a Wichita teacher last fall after a background check failed to uncover that he resigned from a southwest Kansas community college amid a child pornography investigation.

Sixty-two-year-old Steven Thompson, of Wichita, was charged this month with three counts of sexual exploitation of a child in Finney County, where he previously was a tenured computer science instructor at Garden City Community College. Garden City Police Capt. Randy Ralston says school officials reported in September 2013 that child pornography was found on Thompson’s work computer.

Wichita schools spokeswoman Susan Arensman told KWCH-TV that nothing showed up on the background check because Thompson hadn’t been charged when he was hired.

Thompson is free on bond. His attorney didn’t immediately return a phone message.