N.M. Admin. Code § 2.61.9.10
No party or its attorney shall engage in ex parte communications regarding a pending determination with any hearing officer appointed to preside over an administrative hearing. Likewise, a hearing officer shall not engage in ex parte communications on any matter to which that hearing officer has been appointed with any party or its attorney. However, there may be occasions when brief ex parte communications are warranted, for example, for scheduling, administrative purposes, or emergencies that do not deal with substantive matters or issues on the merits. A summary of what was communicated shall be promptly disclosed to the individual who did not participate in the ex parte communication. Board members and staff shall not engage in any ex parte communications on any matter or for any reason related to a pending determination with any party, attorney or interested person.
N.M. Admin. Code § 2.61.9.10