FORT PAYNE, Ala. - Police in Fort Payne say a district attorney's investigator has been charged with drunken driving after a witness saw his car hit a guardrail on Interstate 59.

Al.com reports police arrested Gary Williams during a traffic stop at about 3:30 a.m. Saturday. Fort Payne Police Chief Randy Bynum says Williams is an investigator for the district attorney for the Ninth Judicial Circuit, which covers DeKalb and Cherokee counties.

Bynum says a motorist called police after seeing Williams' Dodge Charger strike a guardrail before turning north on Highway 35 toward Rainsville. He says police officers saw the car moving erratically before they pulled Williams over.

It was not known Saturday if Williams had hired an attorney.