But to subject Arab Americans or Muslim Americans to additional scrutiny on the basis of their origin without a belief, supported by specific knowledge, that they pose a likelihood of mayhem is constitutionally impermissible.
This isn't just for Muslim/Arab-Americans, it's for all travelers, and like I said, country of origin should be one of the biggest factors.
Secondly, we have specific knowledge - we are at war with radical Islam. If you have nothing to hide...