There is growing concern among gun control advocates that mandated background checks for weapons purchasers are inadequate. A report by the Los Angeles Times last week revealed that in Texas, hundreds of felons were granted permits to carry concealed weapons. The paper said the state had failed to carry out complete background checks. However, more than 30 other states allow people to carry concealed weapons, and researchers say it is almost impossible to find out information about crimes committed by permit holders. It's also hard to find out if criminals are slipping through the background check. NPR's Eric Westervelt reports.
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