[0xcde4c3db]

It's been a long time since I've looked into this, but things like this generally are regulated (in the US). The sweepstakes promoter generally must post the odds of winning, and can't actually require a purchase of a product to enter (though you might need to pay return postage and wait 2-4 weeks for the free entry option). Some states have stricter requirements and you'll often see nationally advertised sweepstakes specify that they're not offered to residents of those states.

[caminante]

To this point, one guy mailed ~100 letters to McDonalds asking for monopoly pieces. McDs had to reply with game pieces.