When does acting in self-defence become murder?
It’s the question dividing the United States after the killing of teenager Trayvon Martin by neighbourhood watchman George Zimmerman.
Florida's controversial 'Stand Your Ground' gun law allows people to use lethal force if they feel threatened, not just in their own homes, but anywhere they have a legal right to be.
Since it was introduced in 2005 the rate of ‘justifiable homicides’ has almost tripled.
Amos Roberts looks at the effect that’s had, both on those who've killed and the families of those who’ve died.
And he examines the controversy surrounding the law, with prosecutors saying justice should be served in court, not on the street.
WATCH - Click to see Amos's report.
GUN LAW DEBATE - The 'right to bear arms' has long divided opinion in the United States. Follow the links on the right-hand side of the page for more on both sides of the argument, then tell us what you think on our comments page.
Photos (protests): Getty
On air: 8th May 2012