Agreed.

The pitchers that pitch illegally during warmups tend to be either very experienced (leave 'em alone), or inexperienced / rec level (you may want to mention it to the coach). And, in either case, in any tournament play that matters, leave 'em alone. If they are playing there, they should know the rules.

As teams first make the transition from high school to ASA travel, I do remind pitchers who warm up with NFHS mechanics "two feet on the pitching plate here". Not much else; that one is too much of a "gotcha", IMO, to leave unsaid.

Actually you can do that without a lineup card. You check the official book.

Now I don't see anywhere where the expression "official" is used to describe the lineup card. The only thing I find is official book.

Please advise.

OK. Asa says it is. What does NFHS say?

NFHS 3-1-3

... Lineups become official after they have been exchanged, verified and then accepted by the plate umpire during the pregame conference.

Emphasis added.

Looks like NFHS agrees with ASA.

I think this entire discussion has gotten way out of hand in order to attempt to decide something that is basically common sense. Why would you let someone do something illegal, when you have the ability to stop them? Although some may feel that there is a thin line between 'coaching the coach' and 'preventative umpiring', I don't believe that informing the coach that they are attempting to do something illegal is outside our scope as impartial judges of the contest.