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If I ask a mentally competent patient his name prior to administering
blood, and check the response against the name on the wristband, I may
find the wristband is wrong. Assuming of course that we are living in a
society where the person knows his own name best, and is right to contest
institutional corruptions of his name.
Wristbands are fine for the unconscious, the mentally incompetent
etc., but they can be over relied upon. Bother to know your patient.