Summary

Portrait of John Paul Stevens John Paul Stevens United States v. Hubbell — Opinion of the Court

In sum, we have no doubt that the constitutional privilege against self-incrimination protects the target of a grand jury investigation from being compelled to answer questions designed to elicit information about the existence of sources of potentially incriminating evidence. That constitutional privilege has the same application to the testimonial aspect of a response to a subpoena seeking discovery of those sources.
Source: Wikisource

Portrait of John Paul Stevens John Paul Stevens United States v. Hubbell — Opinion of the Court

IV The Government correctly emphasizes that the testimonial aspect of a response to a subpoena duces tecum does nothing more than establish the existence, authenticity, and custody of items that are produced. We assume that the Government is also entirely correct in its submission that it would not have to advert to respondent’s act of production in order to prove the existence, authenticity, or custody of any documents that it might offer in evidence at a criminal trial
Source: Wikisource

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