Trucks filled with boxes of gun-sales records pull up almost daily to a one-story brick building nestled in the hills outside this blue-collar town. Inside, workers armed with Scotch tape and magnifying glasses huddle over their desks, trying to decipher pieces of paper to trace the paths of guns used in crimes.

The National Tracing Center is the only place in the nation authorized to trace gun sales. Here, researchers with the Bureau of Alcohol, Tobacco, Firearms and Explosives make phone calls and pore over handwritten records from across the country to track down gun owners. In contrast with such state-of-the-art, 21st-century crime-fighting techniques as DNA matching and digital fingerprint analysis, gun tracing is an antiquated, laborious process done mostly by hand. The government is prohibited from putting gun ownership records into an easily accessible format, such as a searchable computer database.

Read the entire Washington Post article here.