You can search the winner’s IP address to see if they entered under multiple names from the same computer.
Don't get me wrong, I love Rafflecopter. I am just saying that this statement does not mean that someone is Cheating. "Cheater" entering under multiple names, same computer" is not always true. I am me and my daughter is her, although we share the same computer, "2" different people.
One other thing, there are so many giveaways out there that most of the time I am afraid to enter because I don't know if I already entered that giveaway. The old way of doing it using comments that you could see at least kept me from entering a contest twice. I now don't enter half as many giveaways as I used to because I don't want to be deemed a "CHEATER". My loss!