Which proposition best describes the core of the Wong Sun 'poisonous tree' doctrine?

• A. Exclusion of evidence derived from illegal government actions
• B. The rights against self-incrimination are absolute
• C. A warrantless search is always valid
• D. The suspect's statements are always admissible

Answer: (A)

The key idea is that evidence obtained as a result of illegal government action is not to be used in court. The “poisonous tree” metaphor means the illegal act by the police taints what they obtain, so physical evidence and other fruits of that unlawful conduct are excluded. Wong Sun clarifies this by showing that the taint can sometimes reach different kinds of evidence, and there are ways the taint can be diminished or avoided (like independent sources or voluntary, untainted statements), but the central rule remains: don’t use evidence that comes from police illegality. That’s why the statement about excluding evidence derived from illegal government actions best captures the doctrine. The other ideas—that self-incrimination rights are absolute, that warrantless searches are always valid, or that a suspect’s statements are always admissible—don’t align with the core purpose of the exclusionary rule and Wong Sun’s refinement.