For various reasons I would like to limit each individual user to registering/using only one account. I realize that there is no perfect way to do this, but what can I do within Drupal to detect cases where users have registered and are using multiple accounts?
I plan to set up a view using uiplog to check whether the same IP address is logging out and then immediately logging in to another account, but what else can I do?
Additional information: The site I am working on requires users to complete a fairly lengthy registration form and then additional information on the first time they log in. As such, I'm primarily concerned about users with multiple accounts trying to game the ratings system within the site. (Abusive users will be handled through an abuse reporting system.)