In many countries around the world, counterfeit and pirated goods are widely available. Transactions involving such products may be illegal under local law. In addition, bringing them back to the United States may result in forfeitures and/or fines.
DUAL NATIONALITY: Mexican law recognizes dual nationality for Mexicans by birth, meaning those born in Mexico or born abroad to Mexican parents. U.S. citizens who are also Mexican nationals are considered by local authorities to be Mexican. Dual-nationality status could hamper U.S. Government efforts to provide consular protection. Dual nationals are subject to compulsory military service in Mexico; in addition, dual national males must register for the U.S. Selective Service upon turning 18. For more information, visit the U.S. Selective Service website. Travelers possessing both U.S. and Mexican nationalities must carry with them proof of citizenship of both countries. Under Mexican law, dual nationals entering or departing Mexico must identify themselves as Mexican.
(Even Americans who go there cannot use our Constitution there. They hate our laws and Constitutions are appear to be working to destroy it here. Or at least use it only themselves. They are lawbreakers, not law-abiders.)