N.M. Const. art. VIII, § 8

[Exemption of certain personalty in transit through the state.] Personal property which is moving in interstate commerce through or over the state of New Mexico, or which was consigned to a warehouse, public or private, or factory within New Mexico from outside the state for storage in transit to a final destination outside the state of New Mexico, manufacturing, processing or fabricating while in transit to a final destination, whether specified when transportation begins or afterwards, which destination is also outside the state, shall be deemed not to have acquired a situs in New Mexico for purposes of taxation and shall be exempt from taxation. Such property shall not be deprived of such exemption because while in the warehouse the property is assembled, bound, joined, processed, disassembled, divided, cut, broken in bulk, relabeled or repackaged. (As added November 6, 1973.)