Can illegally obtained evidence impeach a non-defendant witness?

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Impeachment of a witness with illegally obtained evidence is tightly limited. The exception in impeachment is that a defendant’s own credibility may be attacked with such evidence, but this does not extend to non-defendant witnesses. The reason is to deter police misconduct and protect the defendant’s rights, while avoiding using tainted evidence to undermine the credibility of others. Therefore, illegally obtained evidence cannot be used to impeach a non-defendant witness; it may only be used to attack the defendant’s own testimony.