How can the "exclusionary rule" affect a trial?

The exclusionary rule is a legal principle that serves to protect individuals’ rights by excluding evidence obtained in violation of their constitutional rights, particularly under the Fourth Amendment, which guards against unreasonable searches and seizures. When evidence is obtained through methods that breach this amendment, such as without a warrant or probable cause, the exclusionary rule prevents that evidence from being introduced in court. This rule is crucial in maintaining the integrity of the judicial system, as it discourages law enforcement from engaging in unlawful practices to gather evidence.

In practical terms, if a jury is presented with evidence that was obtained illegally, it could lead to an unfair trial and potential wrongful convictions. By ensuring that only lawfully obtained evidence is admissible, the exclusionary rule upholds the principle of due process, thus preserving the rights of the accused during legal proceedings. This directly impacts how cases are prosecuted and can result in the dismissal of charges if the primary evidence against a defendant is ruled inadmissible.