New Mexico Territorial Laws and Treaties NM TREATIES MEXICO PEACE TREATY, Art. 18

All supplies whatever for troops of the United States in Mexico, arriving at ports in the occupation of such troops previous to the final evacuation thereof, although subsequently to the restoration of the customhouses at such ports, shall be entirely exempt from duties and charges of any kind; the government of the United States hereby engaging and pledging its faith to establish, and vigilantly to enforce, all possible guards for securing the revenue of Mexico, by preventing the importation, under cover of this stipulation, of any articles other than such, both in kind and in quantity, as shall really be wanted for the use and consumption of the forces of the United States during the time they may remain in Mexico. To this end, it shall be the duty of all officers and agents of the United States to denounce to the Mexican authorities at the respective ports any attempts at a fraudulent abuse of this stipulation which they may know of or may have reason to suspect, and to give to such authorities all the aid in their power with regard thereto; and every such attempt, when duly proved and established by sentence of a competent tribunal, shall be punished by the confiscation of the property so attempted to be fraudulently introduced.