and then there is this from the Boston Globe from Sept 2017 related to the Red Sox Apple watch scandal
Your guide to Major League Baseball’s written and unwritten rules regarding the business of stealing signs.
www.bostonglobe.com
"SO WHY IS THIS A BIG DEAL? While sign-stealing is not prohibited, the use of electronic devices in dugouts (save for a couple of specific exceptions that do not involve sign-stealing) is a breach of baseball’s rules. Major League Baseball clarified that stance in a preseason bulletin to teams, which defined the restricted use of electronic equipment thusly:
“The use of electronic equipment during a game is restricted. No Club shall use electronic equipment, including but not limited to walkie-talkies, cellular telephones, laptop computers or tablets, to communicate to or with any on-field personnel, including those in the dugout, bullpen, field and, during the game, the clubhouse.
“No equipment may be used for the purpose of stealing signs or conveying information designed to give a Club an advantage. Laptop computers and hand held devices are not permitted on the bench or in the dugout.
“The only exceptions to this prohibition are the use of a mobile phone for communication between the dugout and the bullpen, and the use of tablets in the dugout or bullpen running uniform programs, so long as such devices and programs have been approved by the Office of the Commissioner.”
The behavior in the Times report — which was reported by the Yankees to the Commissioner’s Office — would represent a breach of that electronic equipment prohibition.
That said, the Red Sox filed a counter claim suggesting that the Yankees had used electronic equipment for their own benefit, employing cameras for the YES Network in an effort to steal signs for their hitters."