N.M. Const. art. IV, § 16

[Subject of bill in title; appropriation bills.] The subject of every bill shall be clearly expressed in its title, and no bill embracing more than one subject shall be passed except general appropriation bills and bills for the codification or revision of the laws; but if any subject is embraced in any act which is not expressed in its title, only so much of the act as is not so expressed shall be void. General appropriation bills shall embrace nothing but appropriations for the expense of the executive, legislative and judiciary departments, interest, sinking fund, payments on the public debt, public schools and other expenses required by existing laws; but if any such bill contain any other matter, only so much thereof as is hereby forbidden to be placed therein shall be void. All other appropriations shall be made by separate bills.