Will Profiling Make a Difference? - Room for Debate Blog - NYTimes.com:
And, even worse, profiling creates two paths through security: one with less scrutiny and one with more. And once you do that, you invite the terrorists to take the path with less scrutiny. That is, a terrorist group can safely probe any profiling system and figure out how to beat the profile. And once they do, they’re going to get through airport security with the minimum level of screening every time.
As counterintuitive as it may seem, we’re all more secure when we randomly select people for secondary screening — even if it means occasionally screening wheelchair-bound grandmothers and innocent looking children. And, as an added bonus, it doesn’t needlessly anger the ethnic groups we need on our side if we’re going to be more secure against terrorism.