What do you do?

[mbyron]

Originally Posted by RadioBlue

...and (correct me if I'm wrong) if it's happened more than once and brought to your attention after the second or subsequent time, now you've got an illegal substitute (ineligible re-entry) and a penalty.

I've thought about this too, and I don't think we could actually get there in a game.

The problem is, at the point where I'd enforce an illegal substitution penalty, either I have certain knowledge of the earlier substitutions or I don't.

If I know about it, I should have disallowed the illegal substitution ("Coach, he can't re-enter in CF, he's already re-entered once.").

OTOH, if I don't know about it, then I can't enforce it as illegal substitution (not enough evidence, can't take the opponent's word for it, etc.).