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On May 13 at 2:45 a.m. Cpl. D. Canning conducted a traffic stop on a vehicle on northbound Md. Rt. 4 near Md. Rt. 260 in Dunkirk.The vehicle was moving at a speed approximately 15 miles per hour under the posted speed limit, swerving into the other lane crossing the dotted white line.Cpl. Canning attempted to make a traffic stop.Initially it appeared the driver was not going to pull over but he eventually stopped in the middle of the passing left lane.The driver, later identified as Byron Antonio Dunn, 38 of Forestville, appeared to be under the influence of alcohol and/or drugs.Dunn was charged with DUI and DWI, possession of marijuana, and was found to have an open bench warrant for his arrest out of Prince George’s County, which was served.