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					Originally Posted by bob jenkins  It's not: 
1) a loophole 
2) a safety hazard
 
It might be distracting, but it shouldn't be and isn't illegal just because it is.
 
Teams run a similar play during action and during throw-ins.  They have never been discussed (afaik ) as being removed from the game. | 
	
 If it were, they'd have to outlaw motion offenses too.