Originally Posted by Ltlabner
Machines are subject to interfearence. Since we don't know the exact system employed I can't say exactly ABC will happen, but trust me, all machines are subject to errors.
But if you know anything about machines/electronics/computers you know that they will go wrong and can be inaccurate if not maintained well.
What you're describing would likely occur so infrequently as to scarcely warrant a mention. I can't imagine baseball installing a system that hadn't been tested under every conceivable condition in order to assuage the concerns of the players, managers, umpires and fans. If a little dirt or a foul tip were enough to throw the sensor off, then it has no business being used in the first place.