Can Illegal Aliens Win the Lottery Or Any Promotional Contests?

By promotional contests like the Pepsi Under the Cap Or Hershey 's Wrapper Contest. Can they keep the prize? Has there been a case like this?

Answer:
from what i here they have to be a citizen but what they are doing is if they win they get a citizen to collect for them and give them a percentage of the winnings they have all kinds of tricks up there sleves
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