It should not, and in many states cannot, be your doctor or anyone working in the health care facility. Some states require it. Some do not. The Registry feels it shows a more serious intent of the document and should be. Most states require that your two adult witnesses not be related to you, may not be your Health Care Surrogate, and may not be beneficiaries of your estate.
Most people give copies of their document to their doctor and family members.
The Registry feels registration is as important as signing your Living Will. Carrying an ID card, knowing that your Living Will is on file where it is easily accessible, and receiving annual newsletters strengthen the goal of your wishes being carried out. Signing a Living Will does not prevent you from being put on life support on a temporary basis. Accidents, major surgery, or lung problems may create a temporary need for life support until the crisis is over. There is not time limit on a Living Will.