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Smith was fired earlier this month after city councilman Ric Dodd accused him of misusing the Georgia Crime Information Center database to look into someone's background, the news station reported.
Smith had been placed on paid leave in February.
Dodd has accused other officers of doing the same thing, resulting in the GBI expanding its investigation.
Interim police chief Pserda Dickerson also asked for the GBI to investigate the department, the station reported, and the Georgia Peace Officers Standards and Training Council is investigating some Lithonia officers.
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