Home2004 Treaties and Agreements ...Bulgaria (13126) – Agreement Regarding Mutual Assistance Between Customs Administrations hide Bulgaria (13126) – Agreement Regarding Mutual Assistance Between Customs Administrations TIAS Office of Treaty Affairs April 1, 2004 Law Enforcement: Customs Assistance Agreement signed at Sofia November 6, 2000; Entered into force April 1, 2004. Download Attachment [939 KB] Tags Bulgaria Law Enforcement Treaties