U.S. Senator Jim Webb, D-Va., penned a letter to D.C. Mayor Vince Gray on Friday decrying the District’s alleged policy of arresting drivers for having expired vehicle registration tags.

“While drivers should be held accountable for such minor infractions, there is absolutely no justification for jailing citizens whose only offense is an expired tag. If true, I hope you will agree that this is a waste of the limited financial resources which the District should be directing toward fighting serious crime,” Webb wrote.