Ahh, the eternal problems with choice, with yes and no, with right and left. The left wishes to preserve all choices forever, even calling upon government to help make that possible. Alas, some choices wash out to sea if we do not choose them.
So in the Duke rape case the charges were dropped when it was proven that the accuser was lying. So yes if it's found that Trayvon is lying about being shot and killed the charges should also be dropped. EDIT: I just reread your question. Yes the DA should be fired and charged if he knows Trayvon was not shot and killed by Zimmerman. I agree with you on this TGregg.