WSB-TV reports that the state Peace Officer Standards and Training Council voted earlier this month to revoke the certification for ex-chief Jeff Baker.
The 43-year-old police chief resigned after his arrest in November on charges of driving under the influence, having an open container, impeding traffic, driving too fast for conditions, improperly changing lanes and a red light violation.
POST director Ken Vance says Baker has until Jan. 6 to appeal the agency's decision.
Baker previously lost his certification three years ago after news reports said he faked his firearms training records. The chief appealed and was allowed to keep working.