Only one group of people has legal permission from the United States government to freely cross into the United States from Mexico without passing through a formal border crossing. It’s a crew of firefighters from Mexico that U.S. authorities say are among the best in the world in fighting wildfires. And with the fire season beginning, it’s likely this group will be called on to help. Lorne Matalon reports from the U.S.-Mexico border at Boquillas.