Candace Leslie was leaving church when she got the call she will never forget. Someone shot Leslie's son four times. Police recovered at least one gun. It was a Glock pistol. Unbeknownst to investigators at the time, the gun once served as a law enforcement duty weapon, carried by a sheriff's deputy more than 2,000 miles away in California. According to data from the Bureau of Alcohol, Tobacco, Firearms and Explosives, the Glock was one of at least 52,529 police guns that have turned up at crime scenes since 2006, the earliest year provided. While that tally includes guns lost by or stolen from police, many of the firearms were released back into the market by the very law enforcement agencies sworn to protect the public. Law enforcement resold guns to firearms dealers for discounts on new equipment and, in some cases, directly to their own officers, records show. Some of the guns were later involved in shootings, domestic violence incidents, and other violent crimes. Reporters surveyed state and local law enforcement agencies and found that at least 145 of them had resold guns on at least one occasion between 2006 and 2024. That's about 90 percent of the more than 160 agencies that responded. Records from 67 agencies showed they had collectively resold more than 87,000 firearms over the past two decades. That figure is likely a significant undercount, however, because many agencies' records were incomplete or heavily redacted.