How is the fruit of the poisonous tree doctrine applied to civil procedure?

Answer 1

In simple layman's terms: If a piece of evidence was received by unlawful means such as a search without a valid search warrant, any evidence that stems from that one illegal search will be considered inadmissible in a court of law. The only way out of this would be being able to articulate that a particular piece of evidence would have come out anyway within normal guidelines of an investigation. Basically, one bad apple search ruins the whole basket.