http://www.tmz.com/2014/11/07/jameis-winston-allegations-point-shaving-louisville-chris-rabb/?adid=hero2
Apparently, there are reports that Jameis helped a high school teammate win a bet that FSU would be losing at halftime against Louisville (which they were). Winston played horribly in that first half and they were down 21-7, something "magical" happened and they came back to win in the second half.
Not sure whether these allegations will turn out to be true or not - or at least proven or not, but there's so much smoke around Jameis that there has to be at least a little bit of fire and if I'm an NFL team I don't know that I would even have him on my draft board.