In the 2004 case of Melvin T. Smith v. Massachusetts, the U.S. Supreme Court ruled on a matter concerning double jeopardy protections under the Fifth Amendment to the Constitution. The defendant, Smith, was charged with two offenses related to illegal firearm possession in Massachusetts state court and acquitted by a judge for one charge during his trial but before jury deliberations began on both charges. However, after acquittal and dismissal of jurors for that day's proceedings, prosecution requested reconsideration which was granted by judge who then reinstated previously dismissed charge against Smith next morning when jurors returned; he was subsequently convicted on this count following jury deliberations. Smith appealed arguing that his conviction violated Double Jeopardy Clause as he had already been acquitted once for same offense prior to retrial and subsequent conviction; however lower courts upheld verdict stating mid-trial judicial rulings could be revisited anytime before final judgment is rendered. Upon reaching Supreme Court though it reversed these decisions ruling in favor of Smith stating once an acquittal has been issued - even if mistakenly or prematurely - it constitutes a final judgement thereby barring any further prosecution or retrials pertaining same offense thus upholding principle of 'double jeopardy' enshrined within Fifth Amendment.

In the dissenting opinion for Melvin T. Smith v. Massachusetts, Justice Scalia argued that the majority's decision to allow a judge to reconsider a midtrial acquittal was in direct violation of the Double Jeopardy Clause of the Fifth Amendment, which prohibits anyone from being prosecuted twice for substantially the same crime. He contended that once an acquittal has been issued - even if it is based on an erroneous understanding of law or fact - it should be considered final and unreviewable due to its constitutional protection against double jeopardy. In his view, allowing such reconsideration undermines this fundamental right and opens up potential avenues for abuse by prosecutors who could use this as a strategy to get two bites at the apple in cases where they fail initially.