Directive regarding the European Investigation Order in criminal matters in relation to Member States which have implemented the Directive For the Member States which have not implemented the afore mentioned Directive: European Convention on mutual assistance in criminal matters of 20th April 1959 (art. 3 ff.) and its additional Protocol of 17th March 1978, approved by statute of 27th August 1997 ; Convention implementing the Schengen Agreement of 19th June 1990, as far as it is still applicable between the states concerned. Convention of 29th May 2000 on Mutual Assistance in Criminal Matters between the Member States of the European Union, and its Protocol of 16th October 2001, as far as it has already been ratified by the states concerned.