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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)
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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