Why hasn't the Maserati driver in D.C. who shot a woman for cutting him off been arrested yet?

On May 21, Washington DC police issued a bulletin seeking the public's assistance in identifying a driver who shot and injured another driver for cutting him off.

The suspect and vehicle, described as a two-door gray Maserati, was captured by a nearby surveillance camera and can be seen in the photo below and in this video:

From True Crime Daily:

Police believe the shooting was the result of a road rage incident,the Washington Post reports.