Interesting article from Wired. It's all about cash and CYA, apparently:

Incentives explain much that is perplexing about security trade-offs. Why does King County, Washington, require one form of ID to get a concealed-carry permit, but two forms of ID to pay for the permit by check? Making a mistake on a gun permit is an abstract problem, but a bad check actually costs some department money.

In the decades before 9/11, why did the airlines fight every security measure except the photo-ID check? Increased security annoys their customers, but the photo-ID check solved a security problem of a different kind: the resale of nonrefundable tickets. So the airlines were on board for that one.

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