Home2003 Treaties and Agreements ...China (13029) – Agreement Regarding Mutual Assistance in Customs Matters hide China (13029) – Agreement Regarding Mutual Assistance in Customs Matters TIAS Office of Treaty Affairs April 10, 2003 Law Enforcement: Customs Assistance Agreement signed at Washington April 9, 1999; Entered into force April 10, 2003. Download Attachment [696 KB] Tags China Law Enforcement Treaties