N.M. Stat. § 43-1-14

A. A person may voluntarily seek admission to residential treatment or habilitation.

B. A guardian appointed under the Uniform Probate Code, an agent or surrogate under the Uniform Health-Care Decisions Act or an agent under the Mental Health Care Treatment Decisions Act shall not consent to the admission of an individual to a mental health care facility. If a guardian has full power or limited power that includes medical or mental health treatment or, if the individual's written advance health-care directive or advance directive for mental health treatment expressly permits treatment in a mental health care facility, the guardian, agent or surrogate may present the person to a facility only for evaluation for admission pursuant to Subsection E of Section 43-1-10 NMSA 1978 .

C. Nothing in this section shall be construed as depriving voluntary clients of any right given to involuntary clients.

D. A client voluntarily admitted to residential treatment or habilitation has the right to immediate discharge from the residential facility upon request, unless the director of the facility or a physician determines that the client requires continued confinement and meets the criteria for involuntary residential treatment or habilitation under the code. If the director or physician so determines, the director or physician shall, on the first business day following the client's request for release, request the district attorney to initiate commitment proceedings under the code. The client has a right to a hearing on the client's confinement within five days of the client's request for release.