I am wondering about center referee mechanics for throw-in. I am getting feedback from referees that they have heard instructors tell them center referees should signal a throw-in with a 90 degree arm signal, rather than the 45 degree arm signal. They are being told to watch the MLS referees. Is this a change to referee mechanics?

USSF answer (July 22, 2009):
When in doubt, follow the instructions in the Guide to Procedures.  The referee “Points 45 degrees upward to indicate direction of throw-in.”

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