Border Patrol agents handcuffed Raymond Mattia as blood from nine bullet wounds soaked through his jacket. They had been responding to a call that shots were fired about a mile from the U.S.-Mexico border. But after encountering Mattia, who was standing steps from his home holding something in his hands, the agents fired dozens of rounds at him after ordering him to drop it. He died 27 minutes after their encounter. A cell phone was found on the ground. Mattia’s family believes that the agents ruthlessly gunned a man down with scant regard for his constitutional rights. But federal prosecutors have already said there will be no criminal charges. A recent Supreme Court ruling means any effort to sue the agents individually for alleged constitutional violations is doomed to fail. The 2022 ruling is one in a line of cases that has decimated the ability of victims to file lawsuits accusing Border Patrol agents of using excessive force or other constitutional violations. Without indivi...