Whether the independent-source doctrine can permit admission of evidence first discovered during an unlawful search but later seized through a lawful search pursuant to a warrant.
Holding
Yes. The doctrine can apply to evidence initially observed during an unlawful entry if the later warrant-authorized search is genuinely independent of the unlawful entry.
Reasoning
The exclusionary rule bars not only evidence directly obtained through an unlawful search, but also derivative evidence obtained as an indirect product of the illegality. The independent-source doctrine is an established limit on that rule: evidence is admissible when it is acquired through a source untainted by the constitutional violation. Its purpose is to place police in the same position they would have occupied absent the illegality, not a worse one.
The doctrine is not confined to evidence discovered for the first time during the later lawful search. Silverthorne recognized that facts learned unlawfully do not become permanently inaccessible if knowledge of them is also gained through an independent source. Likewise, the inevitable-discovery doctrine recognized in Nix v. Williams presupposes that evidence initially found unlawfully may be admitted if an independent investigation actually would have found it.
The Court rejected a distinction between so-called primary evidence observed during the unlawful search and derivative evidence later traced to it. That distinction has no basis in precedent and would produce arbitrary results, such as excluding independently acquired knowledge of a body merely because officers had previously seen the body unlawfully, while admitting it if officers had first unlawfully found only a clue to its location.
The same analysis applies to tangible items such as the marijuana bales. Although the bales had already been observed during the unlawful entry, their lawful seizure under an independent warrant could provide an untainted source. The relevant question is practical rather than metaphysical: whether the later lawful seizure was genuinely independent, not whether an already observed object can somehow be "rediscovered."