A person detained for one hundred twenty hours of evaluation and treatment may be committed for not more than fourteen additional days of involuntary intensive treatment or ninety additional days of a less restrictive alternative treatment. A petition may only be filed if the following conditions are met:
(1) The professional staff of the facility providing evaluation services has analyzed the person's condition and finds that the condition is caused by a behavioral health disorder and results in: (a) A likelihood of serious harm; or (b) the person being gravely disabled; and are prepared to testify those conditions are met; and
(2) The person has been advised of the need for voluntary treatment and the professional staff of the facility has evidence that he or she has not in good faith volunteered; and
(3) The facility providing intensive treatment is certified to provide such treatment by the department or under RCW
71.05.745; and
(4)(a)(i) The professional staff of the facility or the designated crisis responder has filed a petition with the court for a fourteen day involuntary detention or a ninety day less restrictive alternative. The petition must be signed by:
(A) One physician, physician assistant, or psychiatric *advanced registered nurse practitioner; and
(B) One physician, physician assistant, psychiatric *advanced registered nurse practitioner, or mental health professional.
(ii) If the petition is for substance use disorder treatment, the petition may be signed by a substance use disorder professional instead of a mental health professional and by an *advanced registered nurse practitioner instead of a psychiatric *advanced registered nurse practitioner. The persons signing the petition must have examined the person.
(b) If involuntary detention is sought the petition shall state facts that support the finding that such person, as a result of a behavioral health disorder, presents a likelihood of serious harm, or is gravely disabled and that there are no less restrictive alternatives to detention in the best interest of such person or others. The petition shall state specifically that less restrictive alternative treatment was considered and specify why treatment less restrictive than detention is not appropriate. If an involuntary less restrictive alternative is sought, the petition shall state facts that support the finding that such person, as a result of a behavioral health disorder, presents a likelihood of serious harm or is gravely disabled and shall set forth any recommendations for less restrictive alternative treatment services; and
(5) A copy of the petition has been served on the detained person, his or her attorney, and his or her guardian, if any, prior to the probable cause hearing; and
(6) The court at the time the petition was filed and before the probable cause hearing has appointed counsel to represent such person if no other counsel has appeared; and
(7) The petition reflects that the person was informed of the loss of firearm rights if involuntarily committed for mental health treatment; and
(8) At the conclusion of the initial commitment period, the professional staff of the agency or facility or the designated crisis responder may petition for an additional period of either 90 days of less restrictive alternative treatment or 90 days of involuntary intensive treatment as provided in RCW
71.05.290; and
(9) If the hospital or facility designated to provide less restrictive alternative treatment is other than the facility providing involuntary treatment, the outpatient facility so designated to provide less restrictive alternative treatment has agreed to assume such responsibility.