Home2013 Treaties and Agreements ...Nigeria (13-423) – Agreement on Mutual Assistance Between Customs Administrations hide Nigeria (13-423) – Agreement on Mutual Assistance Between Customs Administrations TIAS Office of Treaty Affairs April 23, 2013 Law Enforcement: Customs Agreement signed at Washington April 23, 2013; entered into force April 23, 2013. Download attachment [407 KB] Tags Law Enforcement Nigeria Treaties