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The handgun control statutes of the continental states of the USA in 1966 were coded and scaled for strictness, and strictness was found to be unrelated to the incidence of homicide (by any method) in 1960 and 1970. However, states with the stricter handgun control statutes were found to have lower suicide rates by firearm and lower suicide rates overall.
Lester et al. (Tue,) studied this question.
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