NFHS Interpretations, 1999-2000 Season (from
www.nfhs.org):
SITUATION 17: B1 reaches across the boundary line and touches a ball that is being bounced by the official to thrower-in A1. What is the proper procedure?
RULING: This is a violation of the throw-in plane. The official reports the warning to the official scorer as a team warning for Team B, and instructs the scorer to record the warning in the scorebook. The official shall also inform Team Bs head coach of the warning. Any subsequent violation of the same type shall be a team technical. The official scorekeeper shall notify the official of the second same type violation. (4-46, 9-2-11)