The word spy is silly to me. Guy goes to games and keeps track of something. Frankly, I'm surprised there's a rule against it.
If you're going to use signs and signals, you know - KNOW your opponents are trying to figure them out.
If they figure them out in general, that's on you. If your opponent is simply trying to do so on gameday, that's lazy. I'd be pissed if I found out Florida only tried to figure out the other team's signals during the actual game.
Again, regardless of right or wrong, I confidently assume EVERYONE does this. I can send a guy into a crowd of 80,000 dressed normally to track signals and signs?
YUP! Sign me up.