Mouthguards

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And if a kid wants to play without shoulder pads and his doctor says it's okay.

And if a kid wants to play without a helmet 'cause his doctor says it's okay.

This is an equipment rule and is very clear (no pun intended), and is not the same as holding and other rules, which take advantage gained into account.

Not enforcing this rule is flat out wrong. And if the kid gets hurt and you let him play with illegal equipment, you have no defense in a civil court.

And frankly, there is no good argument against enforcing an equipment rule.