2011 ORS § 127.730¹
Persons prohibited from serving as witnesses to declaration

None of the following may serve as a witness to the signing of a declaration:

(1) The attending physician or mental health service provider or a relative of the physician or provider;

(2) An owner, operator or relative of an owner or operator of a health care facility in which the principal is a patient or resident; or

(3) A person related to the principal by blood, marriage or adoption. [1993 c.442 §13]