A white guy as spy in china??

Hong Kong was controlled by the British for 100 years. Most people speak English, and the tourism industry in Hong Kong and China are pretty big, a small percentage, but a large amount of people who live in southern China have dual citizenship in America or Great-Britain. It would be no more strange to see an asian person in Los Angeles.

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Bishop went into the prison as a NGO (non government organization) or some such thing to attend to the supposed cholera outbreak. It's plausable.

When a man assumes a public trust, he should consider himself as public property - Thomas Jefferson

Bishop was posing as a Foreign Aid Worker and the visit to Su Chou prison was to combat an outbreak of Cholera. So yes, I can see this happening that a Foreign Aid Worker in China would be white.

Also, the Chinese and US were in Free Trade talks at the time, which would be another cover to have white agents operating there.

It's more plausible than the cholera-vaccine being distributed via needle instead of as a consumable 2cl shot like in real life. Tastes like *beep*

Light travels faster than sound,
that's why people seem bright,
until you hear them.