The non-guilty verdict is final, even in the face of new evidence: “[N]or shall any person be subject for the same offence to be twice put in jeopardy of life or limb” (Fifth Amendment to the U.S. Constitution). Sometimes the government gets around this by inventing a new “offence” for the same crime, often at a different political level; for example, you may be acquitted of murder at the state level, but be charged with a “hate crime” at the federal level for the same act.