A California Highway Patrol officer accused of stealing nude photos from a DUI suspect's phone told investigators that he and his fellow officers have been trading such images for years, in a practice that stretches from its Los Angeles office to his own Dublin station, according to court documents obtained by the Contra Costa Times.

CHP Officer Sean Harrington, 35, of Martinez, also confessed to stealing explicit photos from the cellphone of a second Contra Costa County DUI suspect in August and forwarding those images to at least two CHP colleagues. The five-year CHP veteran called it a "game" among officers, according to an Oct. 14 search warrant affidavit.

Harrington told investigators he had done the same thing to female arrestees a "half dozen times in the last several years," according to the court records, which included leering text messages between Harrington and his Dublin CHP colleague, Officer Robert Hazelwood.

Contra Costa County prosecutors are investigating and say the conduct of the officers -- none of whom has been charged so far -- could compromise any criminal cases in which they are witnesses. CHP Commissioner Joe Farrow said in a statement that his agency too has "active and open investigations" and cited a similar case several years ago in Los Angeles involving a pair of officers.