Behavior-screening seems too easy to elude. Terrorists just need to work on their poker faces, figure out what the likely tells are, and practice their answers to all likely questions.
And it seems to me like it can't help turn into a system for racial profiling. If you pick-out the 22-year-old arab guy because he looks nervous and keeps checking his watch, are you going to pick out the 80-year-old white woman who has the exact same behavior, or will you dismiss her as simply being nervous about flying?
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