"used only in extreme terrorism cases"
Bollocks to that. Give me one example where this rule was properly applied - just one.
I know the guy has a terrist beard and I can imagine that he is a lot more suspicious-looking to paranoid racists because, gasp he's not Caucasian, but those elements on their own do not legally constitute proof of terrist intent - yet.
So good on him for standing up for his rights because this circus has been going on for long enough already. I hope that he gets that law struck from the books.