It is unconstitutional to single out any person solely based on their race or ethnicity. It is, however, permissible to use race, in conjunction with other information, if race is one of a number of characteristics used to describe a particular suspect.

In the case of trying to prevent future terrorist attacks by middle eastern Muslim exstremists, who HAVE already attacked the western world on numerous occassions, who've continued to try and attack the western world, and who have openly declared Islamic Jihad on the western world, I think that race has to be a consideration, along with other factors, i.e. one way ticket buying, etc., in determining if someone may be a risk to the security of others.