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These are also referred to as 'Stand your ground' laws. Several states have them but they can vary state-to-state in what they actually allow and don't allow for legally standing your ground when you feel threatened. An alarming number of states have 'Duty to Retreat' laws. Some of those won't even allow you to defend yourself legally inside of your own home!
As the old rule of 'ignorance is no excuse for the law' still stands, and always will, it is everyone's duty to do their due diligence into researching your states laws regarding this matter.
I looked up the George Zimmerman thing after you said that Trayvon was attacking him.