The no-fly list — a list of people so dangerous they are not allowed to fly yet so innocent we can’t arrest them — and the less dangerous “watch list” contain a combined 1 million names representing the identities and aliases of an estimated 400,000 people. There aren’t that many terrorists out there; if there were, we would be feeling their effects.

— "The TSA's useless photo ID rules" by Bruce Schneier in the LA Times