Illegal Pitches and when's enough?

[MD Longhorn]

If she's doing it every pitch, then it takes seven of them for the first run to score; 4 more to score a second run, etc. Fifteen illegal pitches in a row and you have 2 runs, and a 3-0 count.

I've said this to a lot of umpires I'm training - the BEST time (for you and for the players and coach) to catch the illegal pitch is the first time you see it. If they're doing it a lot, and you let a few go and then call it, they likely now have runners on - the penalty is greater because you waited. If she's illegal on pitch one ... CALL IT. The penalty there is simply a ball. Next pitch still illegal... CALL IT. Another ball. Give them time to fix it if they are going to try to fix it.