Summary

Owen J. Roberts United States v. Monia — Opinion of the Court

To attribute caprice to Congress is not to respect its rational purpose when, as here, we find a uniform policy deeply rooted in history even though variously phrased but always directed to the same end of meeting the same constitutional requirement.
I am therefore of opinion that an appearance in response to a subpoena does not of itself confer immunity from prosecution for anything that a witness so responding may testify. There must be conscious surrender of the privilege of silence in the course of a testimonial inquiry. Of course no form of words is necessary to claim one's privilege.
Source: Wikisource

Owen J. Roberts United States v. Monia — Opinion of the Court

Once the confusion is avoided between an act of amnesty and an act which gives immunity in order 'to make evidence available and compulsory that otherwise could not be got' because it could be withheld upon a claim of constitutional privilege, it becomes clear that a witness is not 'entrapped' by requiring him to claim his constitutional privilege before affording him a substitute. A witness is no more entrapped by the requirement that he must stand upon his constitutional rights, if he desires their protection, when there is an immunity statute than he is where there is none at all.
Source: Wikisource

Owen J. Roberts United States v. Monia — Opinion of the Court

It was the refusal to testify, not the refusal to appear as a witness, which Congress took away and for which it gave immunity.
Duty, not privilege, lies at the core of this problem-the duty to testify, and not the privilege that relieves of such duty. In the classic phrase of Lord Chancellor Hardwicke, 'the public has a right to every man's evidence'. [14] The duty to give testimony was qualified at common law by the privilege against self-incrimination. And the Fifth Amendment has embodied this privilege in our fundamental law.
Source: Wikisource

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