A new study by researchers at Johns Hopkins University’s Bloomberg School of Public Health finds that allowing concealed carry on university campuses is unlikely to decrease mass shootings, and may worsen other violent crimes, contrary to some claims of those who support expanding campus carry gun laws.

Eight states currently allow concealed carry on college campuses, while approximately two dozen states leave that decision up to the school.

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In fact, study co-author and Stanford University law professor John Donohue said, “Rather than deter gun violence, the most recent and most rigorous research on right-to-carry laws suggests that the laws are associated with increased violence with guns.”