A 17-year-old boy crashed his parents' car through the doors of Shorecrest High School, then drove it down the hall, sheriff's deputies say.
The car stopped 75 yards later when it hit a security office. Two school workers were still on the property and heard the crash late Friday night.
Police found the teen on school grounds and took him to Harborview Medical Center for a mental evaluation.
Investigators said they do not believe drugs or alcohol played a role.
The boy, from Lake Forest Park, is a student at the school. He was not injured.