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. ”
