Bruce Schneier has a new op-ed questioning the rationale behind checking all air travelers against the government's "no-fly" list, the central feature of the new CAPPS II, "Secure Flight":

Imagine a list of suspected terrorists so dangerous that we can't ever let them fly, yet so innocent that we can't arrest them -- even under the draconian provisions of the Patriot Act.

This is the federal government's "no-fly" list. First circulated in the weeks after 9/11 as a counterterrorism tool, its details are shrouded in secrecy.

But, because the list is filled with inaccuracies and ambiguities, thousands of innocent, law-abiding Americans have been subjected to lengthy interrogations and invasive searches every time they fly, and sometimes forbidden to board airplanes.

It also has been a complete failure, and has not been responsible for a single terrorist arrest anywhere.

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