Research shows that concealed-carry laws don't increase crime :: 08/10/2011

Will letting law-abiding citizens carry concealed handguns deter criminals and offer protection? Or is Jack D'Aurora right (Forum column, July 29) when he states that "heated arguments can escalate into shootings" and that criminals will become "more inclined to pack heat"?

He alleged that my research, published in my book More Guns, Less Crime, ignored such concerns. But obviously D'Aurora did not trouble himself to actually read any edition of my book.

According to D'Aurora, my research found a benefit from concealed-handgun laws merely because it covered the time period from 1977 to 1992, and, supposedly, if I had studied the seven years up to 1999, the results would have been different.

This is absurd. Even the first edition of my book covered up to 1994. I updated the evidence with each new edition, and by the third edition in 2010, I covered county- and state-level data for all the years from 1977 to 2005. No matter the time period, the results remained very similar.