Take this legal considerations when traveling to México.
ENTRY REQUIREMENTS: The Government of Mexico requires that all U.S. citizens present proof of citizenship and photo identification for entry into Mexico. A U.S. passport is recommended, but other U.S. citizenship documents such as a certified copy of a U.S. birth certificate, a Naturalization Certificate, a Consular Report of Birth Abroad, or a Certificate of Citizenship are acceptable. U.S. citizens boarding flights to Mexico should be prepared to present one of these documents as proof of U.S. citizenship, along with photo identification. Driver's permits, voter registration cards, affidavits and similar documents are not sufficient to prove citizenship for readmission into the United States.
Minors require notarized consent from both parents if traveling alone or in someone else's custody, or from the absent parent if traveling with only one parent. Please see also the Children's Issues paragraph below.
A visa is not required for a tourist/transit stay up to 180 days. A tourist card, also known as a FM-T, available from Mexican consulates and most airlines serving Mexico, is issued instead. Travelers entering Mexico for purposes other than tourism require a visa and must carry a valid U.S. passport. The Government of Mexico charges an entry fee of approximately $15.00 per person to U.S. citizens traveling to Mexico's interior.
Upon arrival in Mexico, business travelers must complete a form (Form FM-N 30 days) authorizing the conduct of business, but not employment, for a 30-day period. U.S. citizens planning to work or live in Mexico should apply for the appropriate Mexican visa (Form FM-2 or 3) at the Mexican Embassy or nearest Mexican consulate. U.S. citizens planning to participate in humanitarian aid missions, human rights advocacy groups or international observer delegations also should contact the Mexican Embassy or nearest Mexican consulate for guidance on how to obtain the appropriate visa before traveling to Mexico. Such activities, undertaken while on a tourist visa, may draw unfavorable attention from Mexican authorities because Mexican immigration law prohibits foreigners from engaging in political activity. U.S. citizens have been detained or deported for violating their tourist visa status. Therefore, tourists should avoid demonstrations and other activities that may be deemed political by Mexican authorities. This is particularly relevant in light of the tension and polarization in the state of Chiapas. U.S. citizens and other foreigners have been detained in Chiapas and expelled from Mexico for allegedly violating their visa status or for interfering in Mexican internal politics.
Mexican regulations limit the value of goods brought into Mexico by U.S. citizens arriving by air or sea to $300 per person and by land to $50 per person. Amounts exceeding the duty-free limit are subject to a 32.8 percent tax. For further information concerning entry and visa requirements, travelers may contact the Embassy of Mexico at 1911 Pennsylvania Avenue N.W., Washington, D.C. 20006, telephone (202) 736-1000, or any Mexican consulate in the United States.
DUAL NATIONALITY: As of March 20, 1998, 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 Mexican by local authorities. Therefore, their dual nationality status could hamper U.S. Government efforts to provide consular protection. Dual nationals are not subject to compulsory military service in Mexico. Travelers possessing both U.S. and Mexican nationalities must carry with them proof of their citizenship of both countries. Under Mexican law, dual nationals entering or departing Mexico must identify themselves as Mexican.
DRIVING INFORMATION: U.S. driver's licenses are valid in Mexico. Mexican insurance is required for all vehicles, including rental vehicles. (Please see "Automobile Insurance" below.)
The Government of Mexico strictly regulates the entry of vehicles into Mexico. For detailed information on how to bring a car into Mexico
For additional information concerning Mexican driver's permits, vehicle inspection, road tax, mandatory insurance, etc., please contact the Mexico Government Tourist Organization (MGTO) at telephone 1-800-44-MEXICO (639-426). Travelers are advised to consult with the Mexican Embassy or the nearest Mexican consulate in the United States for additional, detailed information prior to entering Mexico.
AUTOMOBILE INSURANCE: Mexican auto insurance is sold in most cities and towns on both sides of the border. U.S. automobile liability insurance is not valid in Mexico nor is most collision and comprehensive coverage issued by U.S. companies. Therefore, when you cross the border, please purchase auto insurance adequate for your needs in Mexico. A good rule of thumb is to buy coverage equivalent to that which you carry in the United States. If you are involved in an accident, you will be taken into police custody until it can be determined who is liable and whether you have the ability to pay any penalty. If you do not have Mexican liability insurance, you may be prevented from departing the country even if you require life-saving medical care, and are almost certain to spend some time in jail until all parties are satisfied that responsibility has been assigned and adequate financial satisfaction received. Motor vehicle insurance is considered invalid in Mexico if the driver is found to be under the influence of alcohol or drugs. Drivers may also face criminal charges if the injuries or damages are serious.
CUSTOMS REGULATIONS: Mexican customs authorities may enforce strict regulations concerning temporary importation into or export from Mexico of items such as antiquities, medications, medical equipment, business equipment, etc. It is advisable to contact the Mexican Embassy or one of the Mexican consulates in the United States for specific information regarding customs requirements.
CRIMINAL PENALTIES: While traveling in Mexico, U.S. citizens are subject to Mexico's laws and regulations, which sometimes differ significantly from those in the United States and may not afford the protections available to the individual under U.S. law. Americans who commit illegal acts have no special privileges and are subject to full prosecution under the Mexican judicial system. Penalties for breaking the law can be more severe than in the United States for similar offenses. Persons violating Mexico's laws, even unknowingly, may be expelled, arrested or imprisoned.