And now the NFL allows defense to use radio sets. And the MLB uses the PitchCom to communicate between the pitcher and catcher.
It’s the 21st century, if your sport is using hand signals you should fix that. Hand signals exist to be stolen. If you have to outlaw scouting to protect them scouting isn’t the problem.
Yes, most schools could easily implement electronics to signal in the plays.
Until you change the rules, which totally prohibit this kind of thing, it’s still wrong and Harbaugh should pay the price.
Just because you think the rules are stupid, doesn’t mean you can violate them when the rules still exist.