Major League Baseball is fining the Boston Red Sox for misusing Apple Watches to steal pitcher's signals

While this isn't technology being used to violate the law, it is being used for a violation of rules.  From CNBC:

The investigation follows a report that the Red Sox used an Apple Watch to steal signals from the Yankees. A Red Sox trainer was caught looking at his watch and then relaying a message to players. 

While decoding another teams' signs isn't against the rules, using technology to do so is forbidden. 

MLB Commissioner Robert Manfred, Jr. said in a statement that he had investigated the complaint from the Yankees and that an undisclosed fine would be levied. The Yankees will also pay a smaller fine after the investigation determined that the team had separately violated a rule involving the use of the dugout phone in a prior season. . . .