What legal principle prohibits trying a person twice for the same offense?

• A. Habeas Corpus
• B. Due Process
• C. Ex Post Facto
• D. Double Jeopardy

Answer: (D)

The main concept here is the protection against being tried twice for the same offense. This principle, known as double jeopardy, comes from the Fifth Amendment and overall limits on repeated prosecutions. Once a defendant is in jeopardy—when a jury is sworn in or, in a bench trial, when the first witness is sworn—the government cannot retry them for the same offense if they’ve been acquitted, convicted, or the case is dismissed without the defendant’s consent. It also bars multiple punishments for the same offense in a single prosecution. Understanding the Blockburger test helps clarify when separate charges can still proceed: if each offense requires proof of a fact that the other does not, they can be observed as distinct offenses; otherwise, they’re not subject to double jeopardy. The other options don’t fit this specific protection: Habeas Corpus challenges unlawful detention, Due Process concerns fair procedures, and Ex Post Facto laws prohibit retroactive criminalization or punishment.