A witness may not be any of the following:

     (1) A person designated to make health care decisions on the principal's behalf;

     (2) A health care provider or professional person directly involved with the provision of care to the principal at the time the directive is executed;

     (3) An owner, operator, employee, or relative of an owner or operator of a health care facility or long-term care facility in which the principal is a patient or resident;

     (4) A person who is related by blood, marriage, or adoption to the person or with whom the principal has a dating relationship, as defined in RCW 26.50.010;

     (5) A person who is declared to be an incapacitated person; or

     (6) A person who would benefit financially if the principal making the directive undergoes mental health treatment.

[2003 c 283 § 9.]