I can’t verify the documents’ authenticity, of course. That’s the natural advantage that comes with being China, North Korea, or any other opaque dictatorship — you can deny anything without having to let anyone search for the truth. Deniability in the narrower sense is always plausible. In the greater sense, it isn’t. This Wall Street Journal report merely adds some detail, and expands some of the parameters, of what we already know. The Border Police document, dated Jan. 10, 2005,...