How have courts interpreted the doctrine of the fruit of the poisonous tree doctrine?

^12. "The fruit of the poisonous tree doctrine is an exclusionary rule that prohibits the introduction of evidence that is causally connected to an unlawful search [or coercive interrogation]. [Citation.] In the area of constitutional law, the fruit of the poisonous tree doctrine supplies an exclusionary rule that is designed to deter police misconduct. Application of the rule calls for a balancing of interests, including the public's interest in the effective prosecution of criminals. Because the rule exacts a toll on society, its application must be guided by its deterrent purposes and its use must bear some relation to its purposes." (People v. Navarro (2006) 138 Cal.App.4th 146, 157, fn. 6.)