Nearly a month after an unarmed black teenager was shot to death
by a neighborhood watch captain, police in Sanford, Fla., have
yet to make an arrest. Seventeen-year-old Trayvon Martin was
returning from a convenience store near the house of his
father's fiancee in a gated community Feb. 26 when watch leader
George Zimmerman spotted him and called police to report a
"suspicious" person. Moments later, Mr. Zimmerman confronted the
teen — ignoring the dispatcher's advice not to follow the
youngster — and shot him in the chest, apparently as Mr. Martin
pleaded for his life.  When police arrived on the scene, they
found Mr. Martin had been carrying only a bag of Skittles and a
can of iced tea. Yet they did not arrest Mr. Zimmerman, because
they accepted his claim that he had acted in self-defense. Under
Florida's Stand Your Ground Law, adopted in 2005, citizens can
lawfully use lethal force to defend themselves if they have a
reasonable fear of being killed or seriously injured.  The case
has sparked protests aro