You're not wrong about the Fifth Amendment, but you're assuming the compelled testimony is self-incriminating. What if the FBI decides to round up all the peopl

You're not wrong about the Fifth Amendment, but you're assuming the compelled testimony is self-incriminating. What if the FBI decides to round up all the people in the area of a crime, and coerce a doctor to administer some "thought extraction" procedure that would offer evidence of the culprit? If one of the witnesses turned out to be the perpetrator, their testimony would be unconstitutional, but the other witnesses would (in theory) be valid and admissible. In fact, our friends at the CIA have given this prospect plenty of consideration: https://www.cia.gov/library/center-for-the-study-of-intelligence/kent-csi/vol5no2/html/v05i2a09p_0001.htm https://www.cia.gov/library/center-for-the-study-of-intellig...