Hmmm . . . that is the first I have heard of it. It appears that Kastigar v. United States[1] may be the relevant case law. I think it a stretch to imply that i

Hmmm . . . that is the first I have heard of it. It appears that Kastigar v. United States[1] may be the relevant case law. I think it a stretch to imply that it derives from the 5th amendment, however, as the grandparent seemed to do. It seems more a determination that the practice does not violate the 5th amendment. 1. https://en.wikipedia.org/wiki/Kastigar_v._United_States https://en.wikipedia.org/wiki/Kastigar_v._United_States