This protection against double jeopardy in the Bill of Rights is a cornerstone of American criminal law. A prosecutor does not have two chances to convict a defendant of the same crime in the same court.
7 Nevertheless, in the American as in the Roman system, a defendant can be tried for the same crime in two different sovereignties, which generally means on the state and federal levels.
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The third clause of the Fifth Amendment holds that persons in criminal cases shall not be compelled to witness against themselves. The principle is a simple one, namely, that governments must prove their cases themselves; defendants cannot be forced to do it for them. Leonard Levy sees this provision as an embodiment of American political morality, namely, that citizens are the masters of government, not its subjects. He quotes with approval the words of Mr. Justice Fortas: "The principle that a man is not obliged to furnish the state with ammunition to use against him is basic to this conception." 8
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In some ways, however, the Romans went even further than their American heirs in protecting against self-incrimination. Not only was the accused protected from having to testify against himself, but neither could any relative by blood or marriage, or any freedman testify against him except in cases of maiestas , adultery, or fiscal improprieties. The Lex Julia provides that no one who is unwilling should be summoned to give evidence in court against his father-in-law, son-in-law, stepfather, stepson, cousin, or cousin's child, or those nearer in degree; and likewise no one's freedman should be summoned nor the freedman of his child, parent, husband, wife, patron, or patroness. Further, a patron or patroness cannot be compelled to give evidence against a freedman nor a freedman against a patron. 9
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| | VI. In all criminal prosecutions, the accused 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
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