Only the Police deter D.C. crime

According to the Chief of Police for Washington DC, Cathy Lanier,"Police, not private guns, deter D.C. crime". She is basically stating that in the two years since the Heller Decision, only about 900 handguns have been registered in DC, but crime is down significantly.

Hmm, if I was a criminal I would be asking this question.

Is this house one of the 900?