With an investigation funded by SpotlightDC, Washington City Paper reporters have answered this grisly question: Why are DC streets awash in illegal guns that are used to commit more murders every year? Cops, prosecutors and politicians agree a few violent offenders are committing most of the crime; many remain on the street because DC cops have committed errors or screwed up evidence in making gun arrests so that prosecutions fail and bad actors are back out, armed and dangerous, according to reporting by Mitch Ryals and Alex Koma.