Washington (CNN)Georgia Republican Secretary of State Brad Raffensperger has opened an investigation into Fulton County for allegedly violating state rules "requiring absentee ballot drop box transfer forms to be filled out," his office confirmed to CNN on Monday.

A source with knowledge of the investigation cautioned to CNN that the probe "does not have any implications about fraudulent or missing ballots in Fulton any more than it meant that in the other smaller, more conservative counties," saying: "To be clear, we're investigating a rule violation" in Fulton County.

In confirming the probe, the Georgia secretary of state's office noted it had "announced similar investigations in Coffee, Grady, and Taylor counties a few months ago."

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