They do show supportive evidence of some gun laws having a meaningful effect on violent crime, so I'm not sure what they're referring to. For instance, it appears that child access prevention laws, specifically, are associated with a significant reduction in firearm homicides.[2]
RAND does complain that there is insufficient or limited evidence in a lot of areas though, like effect on mass shootings.
They do show supportive evidence of some gun laws having a meaningful effect on violent crime, so I'm not sure what they're referring to. For instance, it appears that child access prevention laws, specifically, are associated with a significant reduction in firearm homicides.[2]
RAND does complain that there is insufficient or limited evidence in a lot of areas though, like effect on mass shootings.
[1] https://www.rand.org/research/gun-policy/key-findings/what-s...
[2] https://www.rand.org/research/gun-policy/analysis/child-acce...