11.   From the records of dealers and manufacturers, the bureau traces guns used in crimes and conducts ballistics tests to match weapons to crime scenes.

12.   It was also the fourth most frequently traced gun by the bureau, which traces guns seized in criminal investigations.

13.   It would also require sellers to collect information on buyers that could be used to trace the guns sold.

14.   Most guns are never traced.

15.   Previously, the bureau mainly traced guns to help police solve crimes.

16.   Second, they cited instances in which manufacturers have cooperated with the government in tracing guns.

17.   So far, they have been unable to trace the gun he used.

18.   The agent called the two federally licensed firearms dealers in the United States to whom the guns could be traced on paper.

19.   The effort to trace the guns comes as new details emerge about the devastation wrought by the two gunmen.

20.   The history of tracing gun used in crimes and seized by police from people carrying them illegally has been a tortured one.