Which circumstance allows for an exception to the double jeopardy rule?

The situation that allows for an exception to the double jeopardy rule is indeed a hung jury. The double jeopardy clause, which is part of the Fifth Amendment, protects individuals from being tried for the same offense after an acquittal or conviction. However, if a jury cannot reach a unanimous verdict, resulting in a hung jury, the trial is considered inconclusive. This means that retrial is permissible because there has been no final determination of guilt or innocence.

In contrast, a defendant's admission of guilt does not operate as an exception to double jeopardy; rather, it can lead to a conviction in a different context. Change of venue refers to relocating the trial to a different jurisdiction due to concerns about obtaining an impartial jury but does not relate to double jeopardy. Finally, supported evidence of innocence is not a factor in determining whether double jeopardy applies; once jeopardy has attached, any new evidence does not allow for a new trial on the same charge. Thus, a hung jury provides a valid ground for retrial without violating double jeopardy protections.