The fatal shooting of 17-year-old Trayvon Martin in Sanford ignited a nationwide debate on gun rights, profiling and Florida's controversial self-defense laws. That debate continues today, when a panel of experts convenes in Orlando to discuss the "stand your ground" law as part of an investigation the U.S. Commission on Civil Rights launched after the teen's death became a cause célèbre. Florida was the first state to adopt "stand your ground," and the killing of Trayvon shone a harsh light on it. Though Zimmerman's lawyers disputed that the controversial law played a role in his acquittal at trial last year,...