Determining when jeopardy terminates is no less important than determining when it begins, but it is a little more complicated. Once jeopardy has terminated, the government cannot detain someone for additional court proceedings on the same matter without raising double jeopardy questions. If jeopardy does not terminate at the conclusion of one proceeding, jeopardy is said to be "continuing," and further criminal proceedings are permitted. Jeopardy can terminate in four instances:

1) after acquittal
2) after dismissal
3) after a mistrial
4) on appeal after conviction

A jury's verdict of acquittal terminates jeopardy, and verdicts of acquittal cannot be overturned on appeal even if there is overwhelming proof of a defendant's guilt or even if the trial judge committed reversible error in ruling on an issue at some point during the proceedings. This fundamental maxim of double jeopardy jurisprudence entrusts the jury with the power to nullify criminal prosecutions tainted by egregious misconduct on the part of the police, the prosecutor, or the court, a tremendous bulwark against tyranny in a democratic society.

A jury can also implicitly acquit a defendant. If a jury has been instructed by the judge on the elements of a particular crime and a lesser-included offense, and the jury returns a guilty verdict as to the lesser offense but is silent as to the greater offense, re-prosecution for the greater offense is barred by the Double Jeopardy Clause. For example, a jury that has been instructed as to the crimes of first- and second-degree murder will implicitly acquit the defendant of first-degree murder by returning a guilty verdict only as to murder in the second degree. A not guilty verdict as to the greater offense is inferred from the jury's silence.

Dismissals are granted by the trial court for miscellaneous procedural errors and defects that operate as an absolute barrier to prosecution. For example, the prosecution must establish that a court has jurisdiction over a defendant before prosecution may commence. Failure to establish jurisdiction will normally result in a dismissal upon an objection raised by the defendant. Dismissals may be entered before a jury has been impaneled, during trial, or after conviction. But jeopardy must attach before a dismissal implicates double jeopardy protection.