(AP) — Lincoln County authorities have the Fairbury Police Department’s newest police vehicle and say they won’t be giving it back soon.

They say it’s evidence in the case against 40-year-old Stanly Colby, a Fairbury police officer who is accused of stealing the 2013 Ford Explorer. Colby was stopped on Sept. 14 on U.S. Highway 83 in Lincoln County, about 200 miles west of Fairbury. He was still wearing his uniform.

Deputies drove him to Lincoln this week for a psychiatric evaluation to see whether he is competent to stand trial. His attorney didn’t immediately return a call Friday from The Associated Press.

Chief Lincoln County Sheriff’s Deputy Roland Kramer says Fairbury can’t have the vehicle back until the case is closed, despite requests from Fairbury’s chief.