ID cards and "secret laws"

I've had several friends question the standard civil libertarian criticism of national identification card efforts, and I'll admit that it's a complicated issue. But John Gilmore's case points out the dangers. Gilmore has been fighting since 2002 to get an explanation for why Americans can't fly on airplanes without identification, when there is no such law on the books dictating such. Turns out the FTA issues "secret" guidelines to the airlines, which normal citizens may not view but neverthless must obey. This is just plain scary. Details on Gilmore's website.