According to a study of four jurisdictions that have banned the use of hand-held devices while driving, the laws have not reduced accident rates. iStockphoto.com hide caption

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A TSA worker searches a bag at Oakland International Airport. Justin Sullivan/Getty Images hide caption

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Homeland Security Secretary Janet Napolitano (L) testifies during a Senate Commerce, Science and Transportation Hearing. Ann Heisenfelt/Getty Images hide caption

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A dummy is used in a demonstration test of seat-back head restraints at the Insurance Institute for Highway Safety. Brian Naylor/NPR hide caption

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