From what I know cwd is spread from saliva of one deer to another, and I see all these commercials for feeders where a deer basically eats feed from a 4" tube from a feeder, personally I would like to say if you're going to feed, do it with a broadcast feeder, not a tube style, while cwd may not be in your area yet, let's keep it that way, and if it is already in your area, you probably shouldn't feed, but if you're going to anyway, broadcast would seem to be a better delivery method than a tray or tube for a deer to feed from.