For public authorities to make reasonable decisions on gun control and ownership policies, they need reliable data, but this National Academies' National Research Council report says current research and data are too weak to support strong policy conclusions. For example, in the thirty-four states with right-to-carry laws, the committee "found no credible evidence that such policies either decrease or increase violent crime." Similarly, there is no credible evidence that the more than 80 gun violence prevention programs reviewed by the committee have had any effect on children's or teens' attitudes, knowledge, or behavior regarding firearms.

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