Firearms have existed for centuries, and murder since the dawn of recorded time. However, there's still no consensus on whether gun control laws save lives. Some studies say they do. Others say they don't, or worse. To try to reconcile the contradictions, I tested the statistical hypothesis that gun control laws affect murder rates in America. I pooled data from 10 jurisdictions that passed gun control laws, spread over 100 years, thousands of miles and millions of people. The rest of the nation served as the statistical control. I found that murder rates tended to rise after gun control laws went into effect, but the rise was small compared to the variation otherwise seen between jurisdictions. Overall, the net effect of gun control laws on murder rates was statistically insignificant.
Kingsley G. Morse Jr.