Detective Scott Coates is charged with aiding and abetting possession of a firearm by a prohibited person.
Coates is accused of allowing a man to keep a gun after the suspect was questioned about a 2007 shooting. He allegedly confiscated the gun at a later date but did not book it into evidence until 20 months later.
Coates is no longer in custody. His trial date was set for Dec. 2. He has been placed on non-duty status with the St. Joseph Police Department.