Does Strengthening Self-Defense Law Deter Crime or Escalate Violence?

Evidence from Expansions to Castle Doctrine

 

ChengCheng†

Texas A&M University

 

Mark Hoekstra†

Texas A&M University and NBER

Forthcoming in the Journal of Human Resources

From 2000 to 2010, (click here) more than 20 states passed so-called “castle doctrine”or“stand your ground”laws. These laws expand the legal justification for the use of lethal force in self-defense, thereby lowering the expected cost of using lethal force and increasing the expected cost of committing violent crime. This paper exploits the within-state variation in self-defense law to examine their effect on homicides and violent crime. Results indicate the laws do not deter burglary, robbery, or aggravated assault. In contrast, they lead to a statistically significant 8 percent net increase in the number of reported murders and non-negligent manslaughters....