Which of the following is NOT an exception to the exclusionary rule?

The choice that is not considered an exception to the exclusionary rule is the use of evidence obtained during a legal search. The exclusionary rule is designed to prevent the admission of evidence that has been obtained in violation of a person's Fourth Amendment rights against unreasonable searches and seizures. However, if evidence is gathered during a search that is deemed legal—meaning that proper procedures were followed and the search was conducted within the boundaries of the law—this evidence is admissible in court.

In contrast, the good faith exception allows for the admission of evidence obtained by officers who were acting on a warrant that they believed to be valid, even if the warrant is later found to be defective. The inevitable discovery rule permits evidence to be used if it can be shown that it would have been discovered lawfully regardless of the unlawful method used to find it. The impeachment of a defendant's testimony refers to the ability to use otherwise inadmissible evidence to challenge the credibility of a defendant’s statements during trial. All these exceptions focus specifically on situations where the typical rules around evidence admission are relaxed under certain circumstances, highlighting the importance and implications of lawful procedure when gathering evidence.