Lithuanian or English under Directive 2014/41/EU regarding the European Investigation Order in criminal matters.
Lithuanian or English under the Convention of 29 May 2000 on Mutual Assistance in Criminal Matters between the Member States of the European Union. Under the European Convention on Mutual Assistance in Criminal Matters of 20 April 1959 requests and annexed documents shall be addressed to in Lithuanian or accompanied by a translation into one of the official languages of the Council of Europe (i.e. English or French).