N.M. Code R. § 22.600.6.14
The parties to the hearing shall be MVD and the driver. The driver may be represented by an authorized attorney at their own expense, who can appear on the driver's behalf. MVD may also be represented by an attorney that has entered an appearance on its behalf. MVD may also designate the law enforcement officer that served the notice of revocation as its case agent for the purposes of the exclusionary rule and for the limited purposes of presenting testimony, exhibits, and making basic evidentiary objections regarding relevancy by filing a written designation before the scheduled hearing. The parties directly, or through an authorized attorney, shall be entitled to call and examine witnesses, to introduce exhibits, to cross-examine witnesses, and to make closing arguments. Rebuttal evidence and argument may only be allowed at the discretion of the hearing officer.
N.M. Code R. § 22.600.6.14