[Klickitat]

They donate the blood that Americans won't donate.

But seriously, many blood banks pay for blood. If you're a poor illegal looking for money, that would be one way to get it.

[Lighthouse Lady]

Once again, just for your information, blood banks do not pay for blood for patients in hospitals. The FDA took care of this some time ago. Plasma centers pay for plasma and some blood is paid for by research companies for research only, not patients.
LL