The movie Double Jeopardy had this as the premise, where a woman who is convicted of and has served time for the murder of her ex husband (who is not dead), plans to kill him as she claims the law will not be able to touch her, because of double jeopardy laws.
Double Jeopardy laws exist in several countries - often under different names.
Does any country have double jeopardy laws that would allow the premise of the movie "Double Jeopardy" to be true?