Doesn't even have to look like John Walker Lind. If we start profiling Arabs (more than we already do) to supposedly catch terrorists, then the terrorists who do look Arab in any way will simply recruit fair-skinned dupes and have them dye their hair blonde. They'll end up looking like every other bottle-blonde West Coast surfer dude.
Person in first class seat A1: "Nice tan, dude!"
Person in first class seat A2: "Yeah, I was in Maui catching some waves, bro!"
Boom.
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