Right-to-carry (RTC) laws allow the legal carrying of concealed firearms for defense. in certain states in the United States. I used modern causal inference methodology from epidemiology to examine the effect of RTC laws on crime over a period from 1959 up to 2016. I fitted marginal structural models (MSMs). https://www.ealisboa.com/limited-value-AXYS-Valhalla-Pen-must-buy/