n the blink of an eye, a peaceful day of yardwork for Penny McCarthy turned into a nightmare. She was on her driveway in Phoenix, Arizona, in a sleeveless shirt, shorts, and slippers, when a team of United States Marshals pulled up in unmarked vehicles and aimed firearms at her. Penny—who is a 67-year-old grandmother—was clearly at their mercy. And yet, the officers threatened to “hit” her, frisked her, placed her in handcuffs and ankle shackles, and drove her away from home. The officers did not so much as check Penny’s driver’s license or run any other basic checks on her identity before violently arresting her. The whole time, Penny calmly but persistently insisted that there must be a mistake. The officers claimed that she was Carole Rozak, for whom they had an arrest warrant. But Penny was not Rozak, and Penny had no connection to Rozak. The officers had made a huge, inexcusable error.