Information may be requested on civil and commercial law and procedure as well as the organisation of the judiciary and, in addition to these fields, in other fields where they relate to the main issues specified in the request. Insofar as the additional Protocol is concerned, information may be requested on criminal law, both substantive and procedural, and the organisation of the judiciary, including the public prosecutor's office, and on law relating to the enforcement of criminal measures. It is important to check beforehand whether the state whose law requires clarification has ratified the Convention and its Protocol in the area concerned, and whether the relevant chapter of the Protocol applies between the states concerned.