William J. Brennan, Jr., Campbell v. United States (365 U.S. 85…
“ It is the responsibility of counsel for defendants, as has been elucidated, to pursue ascertainment of the correctness of the Government's claim that documents which are demandable for production under the Jencks Act are no longer in existence, and for no reprehensible reason chargeable to the Government. That is an issue like any other issue of appropriate evidentiary demand. It is not for the court to question that the foundation for production-here, the existence of a document-is wanting, if counsel for defendants do not question the Government's explanation for non-production. ”
