U.S. citizens can visit within the frontera area, a 26-mile border area of Mexico, for up to 72 hours without a permit. It is always a good idea to carry proof of your citizenship such as a birth certificate or a valid driver’s license. Naturalized U.S. citizens must carry their proof of citizenship.
Restrictions
What You CAN NOT Take Into Mexico
Do not attempt to take knives, guns, ammunition, and/or any dangerous or illegal substances into Mexico. Knives???? New merchandise from the U.S. can raise suspicions, especially if still in the box with the tags attached. So long as you are not taking it to the iterior of Mexico, you won't have problems. Be calm and collected. "No tenga pena!" as they say in Mexico.
What You CAN Bring Back From Mexico
Each visitor is allowed $400.00 worth of duty free goods for personal use every 30 days. There after, every $100.00 is taxed at a flat rate of 10%.
Restrictions on Items Being Brought into the United States
Cigarettes
A person must be 18 years of age to import cigarettes. However, regulations change and it is recommended that you contact the U.S. Customs office before buying any quantity of cigarettes for importation.
Liquor
Texas Residents are allowed 1 Quart or liter of distilled spirits, 3 Gallons of wine, or 24-12 oz containers of beer. Non-Texas Residents are allowed 1 Gallon of distilled spirits or wine (or any combination of the two), or 24-12 oz containers of beer.
There can be no substitutions between the types of beverages. The importation of alcoholic beverages must be for personal consumption and cannot occur more than once in a 30-day period. Minors (persons under 21 years of age) or intoxicated persons may not bring alcoholic beverages into Texas.
All alcoholic beverages imported into Texas are subject to a state liquor tax and an administrative fee. Pay this at the TABC booth after clearing the border checkpoint.
Prescription Drugs
Certain prescriptions may be purchased in Mexico and brought into the U.S. provided that you have a valid U.S. Doctor’s prescription for a reasonable amount. A reasonable amount generally means up to 90 days supply. U.S. Customs may exercise judgment in allowing the transport of prescription drugs. Do not bring any type of diet pills across the border.
Items Strictly Prohibited from Crossing Into U.S.
Hazardous items, guns, switchblades, illegal drugs, some fruits and vegetables including mangos, avocados with seeds (the vendors know this and will remove them), citrus (except limes) and potatoes; all poultry, pork, and products made from them; all birds, exotic animals including sea turtles, stuffed or alive; most exotic animal products such as skins and most animal hides except cowhides.