What constitutes an unreasonable search and seizure?

Defendant argues that the surrender of his bank records to law enforcement officers without his knowledge or consent constituted an unreasonable search and seizure. He relies upon Burrows v. Superior Court, supra, 13 Cal.3d 238, 118 Cal.Rptr. 166, 529 P.2d 590, in which we held that a depositor has a reasonable expectation that his bank will maintain the confidentiality of records which originate with him, and that the bank's voluntary surrender of such records to the police without the aid of any

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