What is established by the exclusionary rule?

The exclusionary rule is a legal principle that serves to protect individuals' Fourth Amendment rights against unreasonable searches and seizures. Under this rule, any evidence obtained by law enforcement through illegal means—such as violations of constitutional rights—is inadmissible in court. This underscores the importance of legal procedures and safeguards in the collection of evidence, ensuring that law enforcement operates within the bounds set by law.

This principle helps to deter police misconduct and upholds the integrity of the judicial system by preventing the government from benefiting from illegal actions. Thus, the correct answer reflects the crucial standard that all evidence must be obtained legally to be admissible in court. Understanding this rule is essential for anyone involved in law enforcement or the legal process, as it emphasizes the significance of procedural compliance and respect for constitutional rights.