[Brom]

I'm not even from the U.S. but it was my understanding that all jackpot/progressive/pool prizes that are won in the States are documented. Meaning they take down your info and report to the IRS. Reporting to the IRS is also some sort of right off for them so they do it, and in turn IRS would check to see if the corresponding winner has congruent numbers. All info above is heresy though.

I do know that if a Canadian wins anything like that they will ID, take down SIN, and personally take the taxes pre-payout. It's quite a hassle to try to get them back from my step-Uncle Sam.