The opinions found in Asked and Answered do not reflect the views of the Steelers organization.
Let's get to it:
MATT WIBORG FROM WADSWORTH, OH: I've noticed that most play-callers cover their mouths with their laminated call sheet. When they closed in on Arthur Smith during the Bengals game, he didn't appear to do so. That got me thinking, do teams have people designated to spy and read lips of the coaches as they are sending in plays? Is it someone's responsibility to try to gather intel and call it in to the respective coaches?
ANSWER: The time factor, the ticking play clock makes what you suggest impossible. The amount of time between plays is 40 seconds, and all communication from the sideline to the field via the in-helmet system is cut off with 15 seconds left on the play clock.

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