The Defense team of Zimmerman did not use stand your ground to dismiss charges. But it was used in securing a not guilty verdict. All the defense had to do was plead not guilty by reason of self defense and then make sure language regarding stand your ground was written in the jury's instructions. Here http://www.scribd.com/doc/153354467/...y-Instructions is a link to the jury instructions given to jurors of the trial. Now a quote from that document.
Zimmerman's defense team and the prosecutors would have discussed and agreed to what would be in that document. Jury instructions are extremely delicate things, the are actually the grounds of many appeals and mistrials due to how easily they can bias a jury. Those instructions were written that way, with the bold part being allowed, because Florida is a stand your ground state. In states that do not have similar stand your ground laws enacted, but just normal self-defense laws, instructions like these would instead state that if the defendant had the ability to reasonable retreat to safety, they are required to do so. Again as I started above Zimmerman's attorneys did not use stand your ground to have the charges dismissed, but it was a major part of their strategy for the trial.In deciding whether George Zimmerman was justified in the use of deadly force, you must judge him by the circumstances by which he was surrounded at the time the force was used. The danger facing George Zimmerman need not have been actual; however, to justify the use of deadly force, the appearance of danger must have been so real that a reasonably cautious and prudent person under the same circumstances would have believed that the danger could be avoided only through the use of that force. Based upon appearances, George Zimmerman must have actually believed that the danger was real.
If George Zimmerman was not engaged in an unlawful activity and was attacked in any place where he had a right to be, he had no duty to retreat and had the right to stand his ground and meet force with force, including deadly force if he reasonably believed that it was necessary to do so to prevent death or great bodily harm to himself or another or to prevent the commission of a forcible felony.