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The exclusionary rule is primarily designed to deter police misconduct rather than protect law enforcement agencies themselves. It operates on the principle that evidence obtained through illegal means, such as unlawful searches and seizures, should not be admissible in court. This rule serves to maintain the integrity of the judicial system and uphold the constitutional rights of individuals.

By excluding improperly obtained evidence, the rule seeks to discourage law enforcement from engaging in unlawful practices, thus promoting lawful conduct during investigations. While the rule may offer a stricter operational environment for police, its core function is to safeguard citizens' rights rather than to shield law enforcement from accountability for their actions.

The other options accurately reflect the role and implications of the exclusionary rule: it does apply to evidence from unlawful searches, it does have a significant impact on what can be used in court, and it serves the purpose of deterring police misconduct by creating consequences for improper actions.