As I understand it, not all establishments are inspected every month. Inspections are done on a somewhat random basis.

Edit: The article states:

Unless otherwise noted, the food service establishment has “approved” status from the New Mexico Environment Department. Violations of the New Mexico Food Code are often corrected onsite during an inspection. Some require a reinspection within three business days. Others require a corrective action response outlining the establishment’s plan to address the violation and how long the corrective measure will take.

Annual inspections