Double jeopardy is a legal concept that prevents an individual from being tried or punished twice for the same offense. This principle is enshrined in the Fifth Amendment of the United States Constitution, which states that no person shall be subject for the same offense to be twice put in jeopardy of life or limb. The rationale behind double jeopardy is to protect individuals from harassment and the misuse of government power. It ensures that once a person has been acquitted or convicted of a crime, they cannot be tried again for the same offense. However, there are exceptions to this rule, such as when new evidence comes to light or if the previous trial was found to be invalid. It's important to note that double jeopardy only applies to criminal cases, not civil cases. Additionally, each jurisdiction may have its own specific laws and regulations regarding this concept. Overall, understanding double jeopardy is crucial for ensuring fairness and justice in the legal system.