NCAA & NFHS differ. Under NCAA 7-6-4b:
"Until the thrown-in ball crosses the plane of the sideline
or endline...No opponent of the thrower-in shall have any
part of his or her person over the inside plane of the
sideline or endline;"
The rule is different under NFHS where an opponent
can extend over the OOB line upon the release of the ball.
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