Primarily because of the Fifth Amendment, specifically the combination of the double jeopardy and due process clauses. See also: Blackstone's formulation: http

Primarily because of the Fifth Amendment, specifically the combination of the double jeopardy and due process clauses. See also: Blackstone's formulation: https://en.wikipedia.org/w/index.php?title=Blackstone%27s_formulation https://en.wikipedia.org/w/index.php?title=Blackstone%27s_fo...