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These are crimes that carry no statutes of limitation on them. That is, prosecution can be commenced at any time following the date of the alleged crime. It can be 1 year after, or 30 years after.
This is a reprosecution following mistrial situation. Mistrials are generally not covered by the double jeopardy clause. If a judge dismisses the case or concludes the trial without deciding the facts in the defendant's favor (for example, by dismissing the case on procedural grounds), the case is a mistrial and may normally be retried. Furthermore, if a jury cannot reach a verdict, the judge may declare a mistrial and order a retrial as was addressed in United States v. Josef Perez, 22 U.S. 579 (1824). When the defendant moves for a mistrial, there is no bar to retrial, even if the prosecutor or judge caused the error that forms the basis of the motion.
And there's no "time limit" on seeking a new trial, except the underlying statute of limitation. That is, if the case is dismissed without prejudice following a mistrial, but the statute of limitations has run before filing a new case, then that would preclude that second case from moving forward. But as there is no statute of limitations in the current crimes implicated, they could still refile.
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