The New York Yankees General Manager, told the Associated Press today, that the Yankees filed a "formal complaint" against The Boston Red Sox, accusing them, particularly their trainers, for "stealing" signs from the Yankees and other teams, using a "APPLE WATCH", then flashing the stolen signs to Red Sox players.
While it is not against the rules to steal signs, it is when you use devices such as a "APPLE WATCH" device, or any other device deemed illegal by MLB.
The MLB Commissioner's office, said it will investigate the complaint and take disciplinary action accordingly, if warranted.
The Red Sox had no comment.