The Georgia Bureau of Investigation is looking into whether a former Hall County school resource officer made unauthorized purchases on a school system credit card, according to authorities.

GBI Special Agent in Charge Kim Williams confirmed the agency had an open investigation involving the Hall County school system and retired Lt. Earl Roach.

Cellphone and home telephone numbers found for Roach were not in service when called Monday by The Times.

Roach began with the Hall County Sheriff’s Office in September 1991 and retired on Feb. 29, according to Hall County human resources.

“On March 4, after Roach’s retirement, the Hall County school system notified the Sheriff’s Office that they had conducted an audit and discovered numerous missing and unauthorized items which had been purchased by Roach using a school system credit card,” Hall County Sheriff Gerald Couch wrote in a statement.

Couch said the Sheriff’s Office conducted an internal investigation before requesting the GBI’s investigation.

Williams and Couch declined to comment further on the investigation.

“(Sheriff Couch) had called me and said he wanted to call in the GBI and have this investigation,” Hall County Schools Superintendent Will Schofield said.

Schofield said Roach had worked for the school system for a long time and “did a lot of good things for the school district while he was here,” but he declined to comment further on the nature of the investigation.