In hand checking I think instead of displacement, you need to look at whether it inhibits the freedom of movement of an opponent. Sometimes some prevenitive officiating in talking to the player and telling them no hands or get your hands off is enough. If you do this and they don't comply get them for hand checking. Many times I've had the coach tell the player that he told you to get your hands off. Get the hand check early and it should solve the problem with the coach and the players for the game.
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