Earl Warren,
Rathbun v. United States — Opinion of the Court
“ And so, a secretary is fairly to be deemed as much of an automatic instrument in the context of our problem as a tape recorder. Surely a police officer called in to facilitate the detection of crime is not such an alter ego. His participation in telephone communications when not authorized by the sender occupies precisely the same position that it occupied in the Olmstead case when this Court sanctioned the practice, and in the Nardone cases where this Court rigorously enforced the prohibition by Congress of what theretofore was a lawful practice. ”
