This is a new one, I haven't heard about this before.
Legally owned guns are frequently stolen and used by criminals. A June 2013 Institute of Medicine (IOM) report states that "[a]lmost all guns used in criminal acts enter circulation via initial legal transaction." Between 2005 and 2010, 1.4 million guns were stolen from US homes during property crimes (including burglary and car theft), a yearly average of 232,400. Ian Ayres, JD, PhD, and John J. Donohue, JD, PhD, Professors of Law at Yale Law School and Stanford Law School respectively, state, "with guns being a product that can be easily carried away and quickly sold at a relatively high fraction of the initial cost, the presence of more guns can actually serve as a stimulus to burglary and theft. Even if the gun owner had a permit to carry a concealed weapon and would never use it in furtherance of a crime, is it likely that the same can be said for the burglar who steals the gun?"