You have a cute standard, “impossible”.
For national security, do not be trying to convince the world’s terrorists and our enemies that we all they need to totally dominate us is bio agents, or even threatening us with something like non weaponized Ebola.
America has not become so primitive that we cannot bring in a sick American doctor or soldier for the best medical treatment, in our safest clinics.
you are the one saying there’d be no problems.
simple thing is not to let known/suspected infected people back into the country, period.
i don’t trust the experts to follow proper protocols because it’s been proven time and again they don’t.