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I choose to carry "all my other cards". It is not illegal not to have "all my other cards". It is not illegal to refuse to produce any of "my other cards" on demand at someone else's say-so.
As such it is far from being "a tiny, barely noticeable card just like all my other cards".
And even the government have given up on the unsustainable "anti-terrorism" angle.Tony Walton, 15 years ago.