TULSA, Okla. (AP) – A former Oklahoma sheriff says a reserve deputy fired an unapproved firearm that he wasn’t qualified to use when he fatally shot an unarmed man.

The Tulsa World reports that former Tulsa County Sheriff Stanley Glanz acknowledged to the Commission on Accreditation for Law Enforcement Agencies that Robert Bates was carrying a personal firearm in April when he shot Eric Harris.

Glanz says Bates wasn’t disciplined for the shooting because the sheriff’s office couldn’t take any action after the volunteer deputy resigned from the department. Glanz also says he waived application requirements for reserve deputies who had previously been law enforcement officers. Bates had been an officer for one year in the mid-1960s.

Glanz was indicted after an investigation held in the wake of the shooting.