Reply to "Velocity, God given? Or can it be drastically improved?"

Is there a definition for a "legal" pop time calculation?  I know the basics, but are there some rules that prohibit the catcher from starting his move long before the ball ever reaches the mitt?  I think I remember seeing some comments here about how catchers "cheat" when it comes to having pop times timed in a showcase type setting (for instance their already standing on the plate when they receive the baseball).

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