What does the exclusionary rule state regarding evidence?

The exclusionary rule plays a crucial role in the legal system by ensuring that only evidence obtained in compliance with constitutional protections can be used in court. Specifically, it prohibits the use of evidence that has been gathered in violation of defendants' constitutional rights, particularly the Fourth Amendment, which guards against unreasonable searches and seizures.

When law enforcement officers collect evidence without a proper warrant or probable cause, or if they violate due process rights while obtaining that evidence, the exclusionary rule mandates that such evidence cannot be presented during trial. This principle not only aims to uphold the integrity of the judicial system but also serves as a deterrent against unlawful police procedures.

In contrast, the other choices do not accurately reflect the restrictions or requirements outlined by the rule. Presenting all evidence in hearings would undermine the purpose of the exclusionary rule, and the notion that evidence can be used if requested by the judge does not align with the protections the rule is designed to enforce. Furthermore, the idea that any evidence collected from any source is admissible disregards the necessity for lawful acquisition of evidence as stipulated by the exclusionary rule. Thus, the correct answer emphasizes the foundational principle that only legally obtained evidence can be used during judicial proceedings.