What does the exclusionary rule prohibit?

The exclusionary rule specifically prohibits the use of illegally obtained evidence in a criminal trial. This rule is grounded in the Fourth Amendment protection against unreasonable searches and seizures, as well as the Fifth Amendment's protection against self-incrimination. Essentially, if evidence is gathered in violation of a defendant's constitutional rights, such as evidence obtained through an unlawful search or seizure, it cannot be introduced in court.

This rule serves multiple purposes: it aims to deter law enforcement from engaging in unconstitutional practices, protects the integrity of the judicial system, and upholds the rights of defendants. When evidence is deemed to be obtained through illegal means, it is excluded from trial, preventing the prosecution from utilizing it against the defendant.