John Marshall Harlan II,
Ryan v. United States (379 U.S. 61…
“ At the hearing the District Judge clearly indicated his opinion that the Government need not show probable cause for suspecting fraud, and ordered Ryan to produce those records which he had available. Although the hearing confirmed Ryan's assertion that no 'necessity letter' had been sent to him, the judge made no mention of this, probably because counsel did not press the point. ”
