A Holly, Mich., high school teacher who used a school computer to view pornographic images was suspended without pay for one semester.

The 22-year veteran of the Oakland County district had been suspended with pay Dec. 10, when school officials began investigating him. The suspension is part of a settlement reached by district and teacher union officials, according to a document obtained by the Flint Journal.

The settlement also requires the teacher to seek counseling while suspended, and his classroom conduct and computer use will be monitored upon his return.

The teacher, whom the newspaper did not identify by name, agreed to the settlement Jan. 31. Based on his annual salary, the suspension will cost him about $15,000, Holly Superintendent Kent Barnes said.

The investigation began when a school computer technician performing routine maintenance saw a web address written on a note pad next to the teacher’s computer.

School officials later determined that the computer in the teacher’s classroom logged 1,200 hits between Nov. 29 and Dec. 9, with about 25 percent of those hits accessing material including graphic nudity and images of sexual activity.

The web sites were accessed both after school and during classroom hours. But the investigation turned up no proof that students saw any of the images, Barnes said.

The district is studying whether to add filtering software to its computers. But “you can’t just rely on filters. There’s not a filter made that can filter everything,” Barnes said. “You’ve still got to supervise and be cognizant.”