Unrep Sub: Say Something or Stay Mum?

[Manny A]

Originally Posted by KJUmp

In your sitch, DC said nothing when you went over to the OC to inquire about the re-entry; but I'm sure you can imagine the possible ****house that could occur if the DC chose to make it an issue.

I can. But again, I would like to know if there's any guidance from ASA that tells umpires to not say anything in this situation.

Batting out of order is clearly an Appeal Play by rule. The umpire is not allowed to bring to the attention of either team when he/she sees an improper batter at the plate. But the unreported substitution situation does not have the same restriction to do nothing until appealed as far as I know. And not all unreported substitution violations would result in an out. So do we say nothing for any/all types, or just those that would create an out when properly discovered?