Assistant Hamilton County Prosecutor Richard Guinan was one of eight people arrested Saturday in a DUI checkpoint on Dixie Highway near Woodridge Boulevard in Fairfield.

Guinan, 36, of Mount Washington, was arrested at 12:45 a.m. on a misdemeanor charge of operating a motor vehicle while intoxicated and a minor misdemeanor traffic charge of failing to drive within marked lanes, according to a Butler County Sheriff's Office report.

The report did not specify his blood-alcohol level or whether he was tested.

Guinan was released on bond from the Butler County Jail at 6 a.m., according to jail records. He'll next have to appear in Fairfield Municipal Court.

Guinan works in the prosecutor's office's felony division. In the past, drunken driving cases were among the cases he prosecuted.

Hamilton County Prosecutor Joe Deters declined comment until he has more information.

Fairfield Police, the Ohio Highway Patrol and the Butler County Sheriff's Office conducted the checkpoint.

A total of 688 vehicles were checked. Authorities issued 25 seat belt citations, three citations for driving under suspended licenses, four for driving with no license and 14 unspecified citations.