MR. JUSTICE BLACKMUN delivered the opinion of the Court.
This case presents the issue whether the introduction into evidence of a person's business records, seized during a search of his offices, violates the Fifth Amendment's command that "[n]o person . . . shall be compelled in any criminal case to be a witness against himself." We also must determine whether the particular searches and seizures here were "unreasonable" and thus violated the prohibition of the Fourth...
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