Official Rules(view all)

NFHS 10-1-2

NFHS 10-1-2/OBR 4.03e

Umpire jurisdiction over a game begins when the umpires enter the field with the intent of remaining there for the duration of the game.

[OBR: jurisdiction begins when the plate umpire receives the lineup cards (and remains in effect through the second game if there is a double header).]