I am not sure what amendment it is in, but I do know what it is called. It is call Double Jeopardy. This concept, as you said, means that a person, if found NOT GUILTY for a crime, can't be tried for that same felony.
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26th Amendment.
The first amendment.
Amendment 15 says all citizens have the right to vote.
26 amendment
Such is the gist of the 12th amendment.