[unspun]

One can specify that people from certain nations will not be allowed to deplane without "a note from their doctor" in the prior 48 hours indicating that he/she has found no symptoms of SARS -- and since they must have that in order to get thru customs, the folks at the point of departure should not choose to allow them on the plane in the first place.

(If necessary though, we could foot the bill to send the "WOP's" back.)

[discostu]

So basically you want to move the quarantine over to somebody else's country. Make them lock up all their outgoing people for 48 hours to determine they have no symptoms of SARS. All your doing is shifting the impossible task to another country. Or forcing them to line up a bunch of "doctors" in their international airports to lie and say everybody is symptom free. Once again completely ineffective and doesn't address any of the basic problems:
How do you know somebody has SARS?
How long does it take to know somebody has SARS?
How long must SARS incubate before any test will know somebody has SARS?
Where will everybody be stored while we're deciding if they have SARS?

You're now back to the original answer which can't work, mass testing, only your shifting the duty over to the Chinese government instead of ours. That's no solution.