Can a coach use a megaphone?

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Wouldn't the correct answer be "Yes he can...but he will probably not like the result of his choice to do so."

We cannot stop an act from happening. We can, however, punish those acts that run afoul of the rules.

[imagomer]

Thanks - I especially appreciate the "yes he can, but" response.
I'm not quite old, but I was thinking about maybe becoming old and possibly not having enough air in the pipes to make myself heard.