Have any of the you EMS/Fire/or even Military folks seen someone with a tattoo referencing their medical history, allergies, diseases, bloodtype etc...? Would this info be helpful to EMS or emergency room staff after a person has either been involved in a critical or SHTF incident? Or would it be a waste of tattoo ink and time? If helpful, my assumption is that the best place to put the tattoo would be on the torso. Of course, I've been wrong before.