This combination of 2005 and undated file photos shows one of Charles A. McCoy Jr.'s guns included in evidence during his 2005 murder trial in Columbus, Ohio, left, and a side crash test on a 2008 PT Cruiser by the Insurance Institute for Highway Safety. Nearly as many Americans die from guns as from car crashes each year. We know plenty about the second group and little about the first. A lack of research on how to prevent gun violence has left policymakers shooting in the dark as they craft gun control measures without evidence of what works. (AP Photo/Tim Revell, Insurance Institute for Highway Safety)

Associated Press
This combination of 2005 and undated file photos shows one of Charles A. McCoy Jr.'s guns included in evidence during his 2005 murder trial in Columbus, Ohio, left, and a side crash test on a 2008 PT Cruiser by the Insurance Institute for Highway Safety. Nearly as many Americans die from guns as from car crashes each year. We know plenty about the second group and little about the first. A lack of research on how to prevent gun violence has left policymakers shooting in the dark as they craft gun control measures without evidence of what works. (AP Photo/Tim Revell, Insurance Institute for Highway Safety)
This combination of 2005 and undated file photos shows one of Charles A. McCoy Jr.'s guns included in evidence during his 2005 murder trial in Columbus, Ohio, left, and a side crash test on a 2008 PT Cruiser by the Insurance Institute for Highway Safety. Nearly as many Americans die from guns as from car crashes each year. We know plenty about the second group and little about the first. A lack of research on how to prevent gun violence has left policymakers shooting in the dark as they craft gun control measures without evidence of what works. (AP Photo/Tim Revell, Insurance Institute for Highway Safety)
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