From Bearing Arms:

That much was reported at the time, but now the News4 I-Team has the federal documents proving a concerning number of guns the Metropolitan Police Department helped bring into the District ended up at crime scenes. So many guns recovered at crime scenes, in such a brief period, that the Bureau of Alcohol, Tobacco, Firearms and Explosives placed D.C. police into a program designed to give extra scrutiny to dealers with higher levels of so-called crime guns.