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[chapmaja]

Originally Posted by RKBUmp

The rule says nothing about the umpire being obligated to enforce it when noticed. The rule says may be discovered by the umpire.

However, if you as an umpire notice it, since it is a rules violation, you are obligated to call it. It's called doing your job. The rule certainly does not say, "The umpire may notice an illegal substitute and fail to act upon it"

The simple fact is when you notice something illegal you have an obligation to act upon that knowledge in accordance with the rules.