This photo taken Jan. 23, 2013 shows Bureau of Alcohol, Tobacco, Firearms 

This photo taken Jan. 23, 2013 shows Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) tracer  Debbie Marshall reaching for a microfilm roll of firearm transaction documents, from firearms dealers no longer in business, as she researches a firearm used in a crime, at the National Trace Center in Martinsburg, W.Va.   (AP Photo/Cliff Owen)
Associated Press
This photo taken Jan. 23, 2013 shows Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) tracer Debbie Marshall reaching for a microfilm roll of firearm transaction documents, from firearms dealers no longer in business, as she researches a firearm used in a crime, at the National Trace Center in Martinsburg, W.Va. (AP Photo/Cliff Owen)
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