MR. JUSTICE BLACKMUN delivered the opinion of the Court.
This case presents an issue of the appropriateness of an extension of the judicially created exclusionary rule: Is evidence seized by a state criminal law enforcement officer in good faith, but nonetheless unconstitutionally, inadmissible in a civil proceeding by or against the United States?
I
In November 1968 the Los Angeles police obtained a warrant directing a search for bookmaking paraphernalia...
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