Which amendment protects against double jeopardy?

The protection against double jeopardy is enshrined in the Fifth Amendment to the United States Constitution. This amendment explicitly states that no person shall "be subject for the same offense to be twice put in jeopardy of life or limb." This means that an individual cannot be tried again for the same crime after they have already been convicted or acquitted, providing a significant safeguard in the legal system to protect individuals from repeated prosecutions that could lead to harassment or unfair punishment.

Understanding this provision is crucial for law enforcement officers, as it underscores the importance of ensuring that legal processes are respected during investigations and prosecutions. The other amendments mentioned serve different purposes: the Fourth Amendment protects against unreasonable searches and seizures, the Sixth Amendment guarantees the right to a fair trial, including the right to counsel and to confront witnesses, and the Eighth Amendment prohibits excessive bail and cruel and unusual punishment. Each amendment plays a distinct role in safeguarding legal rights, but it is the Fifth Amendment that specifically addresses the issue of double jeopardy.