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Now Playing: 4-19-13 Marketplace Tech: Could Smart Firearms Help with Gun control

Gun control advocates are looking for new options, including some tech strategies. On Wednesday, seven measures failed in the U.S. Senate, including an amendment that would have expanded background checks. Some gun control advocates are now looking in new directions. So-called 'smart guns' are firearms that only authorized users can fire. But so far, there's not a single one on the market in the U.S.