Courtesy runner implementation

[bob jenkins]

Originally Posted by rbmartin

Page 64 NFHS rule book:
7) A player who violates the courtesy-runner rule is considered to be an illegal substitute.

Do I use the penalty prescribed in Rule 3 Art 1. (calling the player out)
Is it my job to prevent an illegal substitution or let the cheating/incompetent coach commit the infraction and penalize it after the fact?

Yes you use the penalty, and yes you should prevent it if you can, just like any other "substitution"