All defensive players are responsible for knowing if a player has passed the ball and must make a concerted effort to not hit him once he has throw it. The judgement comes in deciding if the defender is too close to altar his path or his charge once the ball is thrown.
A veteran referee once told me he judged it like this: If the defender tackles the passer, no roughing. If the defender hits the passer but does not try to wrap him up and tackle him, it is roughing because he obviously knew the passer no longer had the ball.
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