(a) Except as provided in subdivision (b), none of the following persons may make health care decisions as an agent under a power of attorney for health care or a surrogate under this division:

1. (1) The supervising health care provider or an employee of the health care institution where the patient is receiving care.
2. (2) An operator or employee of a community care facility or residential care facility where the patient is receiving care.

(b) The prohibition in subdivision (a) does not apply to the following persons:

1. (1) An employee, other than the supervising health care provider, who is related to the patient by blood, marriage, or adoption, or is a registered domestic partner of the patient.
2. (2) An employee, other than the supervising health care provider, who is employed by the same health care institution, community care facility, or residential care facility for the elderly as the patient.

(c) A conservator under the Lanterman-Petris-Short Act (Part 1 (commencing with Section 5000) of Division 5 of the Welfare and Institutions Code) may not be designated as an agent or surrogate to make health care decisions by the conservatee, unless all of the following are satisfied:

1. (1) The advance health care directive is otherwise valid.
2. (2) The conservatee is represented by legal counsel.

3. (3) The lawyer representing the conservatee signs a certificate stating in substance:
   

   “I am a lawyer authorized to practice law in the state where this advance health care directive was executed, and the principal or patient was my client at the time this advance directive was executed. I have advised my client concerning his or her rights in connection with this advance directive and the applicable law and the consequences of signing or not signing this advance directive, and my client, after being so advised, has executed this advance directive.”