Okay.
"The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.
Who defines unreasonable?
A judge when the request for a search warrant is presented, or a peace officer when articulable probable cause or reasonable suspicion exists.
Try common sense. What's reasonable about searching the purse of an 80 year old woman while letting Ahmed and his backpack pass on through just because it's the old woman's turn to be searched? What's reasonable about *not* profiling? Please, enlighten us.