Chapter I General Provisions

Article 2 (Restrictions on Assistance)

(iii) With respect to a request for examination of a witness or provision of articles of evidence, unless otherwise provided by a treaty, when the requesting country does not clearly demonstrate in writing that the evidence is essential to the investigation.

Chapter II Collection of Evidence

Article 11 (Request for Issuance of a Warrant)

A request for issuance of a warrant or examination of a witness shall be accompanied with the document set forth in item (iii) of Article 2; except that this shall not apply when a treaty provides otherwise.

Article 96
Contents of request for other forms of assistance under article 93
3. Upon the request of the Court, a State Party shall consult with the Court, either generally or with respect to a specific matter, regarding any requirements under its national law that may apply under paragraph 2 (e). During the consultations, the State Party shall advise the Court of the specific requirements of its national law.

Article 97
Consultations
Where a State Party receives a request under this Part in relation to which it identifies problems which may impede or prevent the execution of the request, that State shall consult with the Court without delay in order to resolve the matter. Such problems may include, inter alia:
(a) Insufficient information to execute the request;
(b) In the case of a request for surrender, the fact that despite best efforts, the person sought cannot be located or that the investigation conducted has determined that the person in the requested State is clearly not the person named in the warrant; or
(c) The fact that execution of the request in its current form would require the requested State to breach a pre-existing treaty obligation undertaken with respect to another State.