Stand Your Ground Q&A - Orlando Sentinel
At the center of the controversy surrounding the shooting death of 17-year-old Trayvon Martin is a Florida law that changed America's definition of self-defense.
The "Stand Your Ground" law, which enables people who perceive a threat to use deadly force without first trying to retreat from a confrontation, was a landmark when it passed in 2005. Since then, 16 more states have adopted similar laws, which are far more lenient than the widely adopted "Castle Doctrine," which allows people to defend themselves in their homes.
Adoption by states http://en.wikipedia.org/wiki/Castle_doctrine