Home2000 Treaties and Agreements ...Mexico (13103) – Agreement Regarding Mutual Assistance Between their Customs Administrations hide Mexico (13103) – Agreement Regarding Mutual Assistance Between their Customs Administrations TIAS Office of Treaty Affairs June 20, 2000 Law Enforcement: Customs Assistance Agreement signed at Washington June 20, 2000; Entered into force June 20, 2000. Download Attachment [875 KB] Tags Law Enforcement Mexico Treaties