Sherwood Police arrested 45-year-old Simon Harris for criminal trespass, possession of marijuana on a school campus and public sexual indecency.
A teacher at Sylvan Hills Elementary school was leaving her classroom just before 11:00 on a Saturday morning in September when she noticed a nude man "gratifying himself" in the outdoor hallway, according to an incident report filed with the Sherwood Police Department.
Startled by the teacher's presence, Harris reportedly picked up his clothes, which were in a pile against the wall across the hall, and ran off.
Harris was arrested and released last Wednesday.
He is due in court Oct. 30.