Once you find yourself in Mexican territory, you will be free to travel and circulate within or without having to fill out more migratory forms. They will only be able to request the presentation of customs declaration forms when you leave a city near a border and head for another within the same country.
Nota bene.- This information is provided as a service to the public. Therefore you are advised to verify it directly with the customs authorities by visiting the following websites:
Most of the information contained on this menu forms part of the manual of tourist entry prepared by La Secretaría de Turismo, Aduana de México, Banjercito, el Instituto Nacional de Migración, la Secretaría de Comunicaciones y Transportes y la Secretaría de la Defensa Nacional. The manual of tourist entry can be downloaded from the website of La Secretaría de Turismo.