A convicted felon from Snellville was arrested after a Gwinnett County deputy using a high-tech device that scans license plates found nine guns and more than 1,200 rounds of ammunition in his vehicle. When William Harold Brown drove past Deputy James Redfern on Indian Trail Road, the license plate recognition system installed in Redfern's patrol car alerted him that the tag on Brown's 1998 Hyundai Accent was stolen, said Gwinnett sheriff's spokeswoman Stacey Bourbonnais. The deputy followed Brown, 34, until he stopped at a nearby laundromat Monday, Bourbonnais said.