It isn't as bad if you have a static IP address, since only one account will then be able to vote.
However, DA~Kaitou, looking at your IP, seems you have a dynamic one anyway. Well, yeah, try to keep them from voting, and there's nothing you have to worry about. IN CASE it happens, and you find out that you accidentally voted twice, or a kid voted at the same time as you, send in a ticket, and we'll deal with it, so you won't be punished.