Joseph McKenna, Burrell v. Montana — Opinion of the Court
“ A narrower contention might have been yielded to by the state courts. It certainly should have been submitted to them. The statute does not prohibit the use of testimony against the consent of him who gave it. It prescribes a rule of competency of evidence which may or may not be insisted upon. It does not declare a policy the protection of which cannot be waived. And the time to avail of it is when the testimony is offered. After the testimony is admitted, its probative force cannot be limited. ”
