Just to add further ''dirt'' to this,
OK assume you take medication for whaterver, and on your tag it states 20cc of say xvx to aid your condition,
you go to the doctors, they then remove said medication, and say you need 40cc of vxv, as the previous medication was causing you some other problem.
on your way home you collect said new medication, take it, then get knocked from your bike, and unconscious.
along comes friendly ambulance crew, who assuming they can access ice tag, sees that you require 20cc of old medication, and give you it.
bearing in mind you have just been taken off it and had it replaced, of which you have already taken the new stuff.
oops now deep kaka, over prescribed and probably needing a lot of further medical care, hopefully not the mortician.
all because the medical staff assumed from your details, rather than allowing the natural medical information kept on your medical files once at hospital.
only a thought