which is exactly my point.  we routinely asses limits on what constitutes a sincere religious belief.  I believe this is a reasonable limit.  
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Further, the editorial makes the assumption that these are sincere religious beliefs.  The vast majority of muslims disagree with the editors.  they seem to be misinformed on this front.
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the supreme court definition is not terribly useful, since as you've pointed out they would need to cross examine those who are covering their face to determine if it is due to a sincere belief and meets the supreme courts definition