call me crazy but I think all the espionage type stuff should be completely legal
its great for the game, adds another layer to the competition and is honestly fun to watch imho
I grew up within a 1/4 mile of where the Cowboys used to practice & we could stand on egg crates to watch or from the balcony on the hotel behind the field. They never gave us kids much hassle for watching from egg crates but they always ran us off from the hotel balcony. I realize that was partly due to them running a business so they didn't want hundreds of kids hanging out on their balconies trying to watch the Cowboys practices but we also heard Landry was paranoid about other teams being able to spy on them from there so they rented out those hotel rooms
plus when George Allen was coach of the Washington Redskins, he was really paranoid about spying which was hilarious to read about and added another layer to the rivalry
teams can simply use counter-strategies to make the information useless or to set them up knowing "we know that they know that we know that they know..."
I have a similar feeling about air pressure. If your offense wants to play with a deflated ball, fine, but you have to play with that pressure the entire game and on all kicks. So, if a team chooses to completely deflate the ball, good luck passing the ball or kicking field goals, etc.
imho, they need to remove as much legislation from the game as possible, its a distraction, boring to follow and slows down the game not to mention I can no longer have spontaneous excitement about a play because I've been conditioned to expect the rug pulled out from beneath me the inevitable penalty