Prevent users from resubmitting info?

I have a short qualifier survey on my webpage. I would like to have it so that if a user submits data and they do not qualify, they are prevented from visiting that page again to try again to qualify(I do not only want to prevent them from hitting the back button, which I know how to overcome, but I want it so that even if they click the link for the qualifier, it won't let them take it again). I know the solution would most likely be negated by clearing history, but I would still like this in place. What code would allow me to accomplish this?