Byron White, Turner v. United States (396 U.S. 398…
“ If it is true, as the Gvernment contends, that heroin is not produced in the United States and that any heroin possessed here must have originated abroad, the jury, based on its own store of knowledge, may well have shared this view and concluded that Turner was equally well informed. Alternatively, the jury may have been without its own information concerning the sources of heroin, and may have convicted Turner in reliance on the inference permitted by the statute, perhaps reasoning that the statute represented an official determination that heroin is not a domestic product. ”
