What is the "exclusionary rule"?

The exclusionary rule is a legal principle that serves to protect individuals from the use of evidence that has been obtained in violation of their constitutional rights. Specifically, this rule prohibits the use of illegally obtained evidence in criminal trials, ensuring that law enforcement agencies adhere to legal standards and respect citizens' rights.

For example, if police conduct a search without a warrant or probable cause, any evidence collected during that search cannot be used against the individual in court. The rationale behind the exclusionary rule is to deter law enforcement from engaging in unlawful practices, thereby upholding the integrity of the judicial process and protecting constitutional rights, such as the Fourth Amendment's protection against unreasonable searches and seizures.

In contrast, the other options deal with distinct aspects of legal proceedings or police practices that do not relate to the principle of excluding illegally obtained evidence. Thus, the answer clearly aligns with the definition and purpose of the exclusionary rule.