According to the Department of Justice's Bureau of Alcohol, Tobacco, Firearms and Explosives, at least 70 percent of firearms found in crime scenes in Mexico can be traced back to the neighbors to the north.Some 250,000 people crossed the southern border into the U.S. in December of last year. The majority of those were people from Mexico.And survey data pulled by Reuters from the Kino Border Initiative, a large migrant shelter in Nogales, Mexico, shows that violence, not economic factors, is forcing many families to leave Mexico.We discuss what work is being done to stop the flow of guns into Mexico. Want to support 1A? Give to your local public radio station and subscribe to this podcast. Have questions? Connect with us. Listen to 1A sponsor-free by signing up for 1A+ at plus.npr.org/the1a.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy