But in the contemporary era, Continental laws have formed the principle on the basis of the adjudged force, while Anglo-American laws take protection against double jeopardy as the basis of it.

一事不再理原则起源于古罗马法，在近现代大陆法系形成了以既判力为基础的一事不再理原则，而英美法系则形成了以禁止双重危险为基础的一事不再理原则。

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Also,there is constitutional protection against double jeopardy being put on trial twice for the same crime.

VOA: special.2009.08.31

Another key aspect of the Knox case: The Italian system does not include U.S. Fifth Amendment protection against a defendant being put in double jeopardy by government prosecution.

NPR: Knox Case Puts Italian Justice Under Scrutiny