Edward Douglass White, United States v. Thompson (251 U.S. 407…
“ As to the Pennsylvania cases, they undoubtedly support the existence of the exception, not in virtue of any statutory provision to that effect, but solely in contemplation of the common law of the state. But, in view of what we have just said concerning the error upon which the exception rests, its departure from the common law, its conflict with the settled rule applicable in the courts of the United States, as sustained by the decisions of this court, we are unable to accept the doctrine of the Pennsylvania cases as being even persuasively controlling. ”
