(1) A valid request for medication under this chapter shall be in substantially the form described in RCW 70.245.220, signed and dated by the patient and witnessed by at least two individuals who, in the presence of the patient, attest that to the best of their knowledge and belief the patient is competent, acting voluntarily, and is not being coerced to sign the request.

(2) One of the witnesses shall be a person who is not:

(a) A relative of the patient by blood or by law;

(b) A person who at the time the request is signed would be entitled to any portion of the estate of the qualified patient upon death under any will or by operation of law; or

(c) An owner, operator, or employee of a health care facility where the qualified patient is receiving medical treatment or is a resident.

(3) The patient's attending qualified medical provider at the time the request is signed shall not be a witness.