When criminals can’t tell who’s armed, and it’s extremely easy to carry concealed, they tend to be less criminal.
“We find that the effect of right-to-carry laws on murder is negative but not significantly different from zero in the year of adoption. However, the effect becomes negative and statistically significant in the following years.
This suggests that it takes time for people to get permits and start carrying guns, and that it takes time for the effects of this to be felt on crime rates.”