N.M. Stat. § 4-37-12
The Home Rule County Validation Act [4-37-10 to 4-37-13 NMSA 1978] shall operate to supply such legislative authority as may be necessary to validate any amendments to a county charter adopted under Article 10, Section 5 of the constitution of New Mexico allowing the county to exercise the powers provided for in Article 10, Section 6 of the constitution of New Mexico and any acts and proceedings heretofore taken under such charter amendments which the legislature could have supplied or provided for or can now supply or provide for in the law under which such amendments were adopted and such acts and proceedings were taken. The Home Rule County Validation Act, however, shall be limited to the validation of charter amendments, acts and proceedings to the extent to which such validation can be effectuated under the state and federal constitutions. The Home Rule County Validation Act shall not operate to validate, ratify, approve, confirm or legalize any charter amendment, act, proceeding or other matter which has heretofore been determined in any legal proceeding to be illegal, void or ineffective.
NMS § 4-37-12