Amendment 6

In all criminal prosecutions, the accused shall enjoy the right to a speedy and public trial, by an impartial jury of the state and district wherein the crime shall have been committed, which district shall have been previously ascertained by law, and to be informed of the nature and cause of the accusation; to be confronted with the witnesses against him; to have compulsory process for obtaining witnesses in his favor, and to have the assistance of counsel for his defense.

This is from http://www.law.cornell.edu/constitution/sixth_amendment

This amendment is important so that people do not have to wait for long periods of time on a trial. So they can be guilty or innocence faster.