sir82,
I know we have no way of tracking what they use the money for, but they've made several announcements about ear-marking money for relief work (Katrina, Haiti, etc.) as they have to use it for that and not for something else. Legally they would have to prove where the money went if they were ever audited. There are many examples of other charities that have been caught improperly using funds.
It was just a question to satisfy my curiosity more than anything else.