When reporters asked Baltimore police and state agencies where the guns used in city crimes came from, no one could provide specific information.
"I can tell you that the vast majority, 95 percent plus, are committed with illegal guns," Baltimore police spokesman Anthony Guglielmi said. But he didn't use data to support that widely held assumption.
Local law enforcement agencies don't have that information because of a federal blockage of gun tracing data. Police also can't reveal what gun tracing data they do have because a federal law passed a decade ago shields most firearm tracking information from the public.
Gun tracing information was public until...