The NFHS rule book says "if a player who receives a blow to the head & shows signs of a head injury [ headache,dizziness, confusion,balance problems etc. ] should be taken out of the game. He can return the same day if cleared by an appropriate health care professional."
The Monroe county A.D.'s have made a ruling stating a player cannot return until cleared by the school Nurse. So if a team plays a double header he cannot play either game if injured in the 1st game. We should use this in all our high school games.
Jim Billitier, RDUA Rules Interpreter