10. While a preparation for cross-examination is undeniably a part of the overall preparation for trial, it is not, in and of itself, a sufficient basis for an issuance of subpoena. […] In entertaining a request for a subpoena, a Trial Chamber is therefore entitled to take into account the fact that a witness whom a party seeks to subpoena is scheduled to testify during the trial, and to refuse the request where its sole rationale is to prepare for a more effective cross-examination. A subpoena involves the use of judicial power to compel, and as such, it must be used where it would serve the overall interests of the criminal process, not where it would merely facilitate a party’s task in litigation […].

[…]

12. Where a witness is listed by one party as expected to testify on its behalf with respect to certain issues, it does not necessarily follow that this witness will have no information of value to the opposing party on other issues related to the case. The opposing party may have a legitimate expectation of interviewing such witness in order to obtain this information and thereby better prepare a case for its client. To deprive this expecting party of such ability would hand an unfair advantage to the opposing party, which would be able to block its opponent’s ability to interview crucial witnesses simply by placing them on its witness list.

13. Moreover, the party which placed the witness in question on its list of witnesses may then decide not to call the witness at all. While the other party, such as the Defence in this case, could subsequently petition the Trial Chamber for a subpoena to obtain information from the witness, that party would have lost valuable time in procuring this information and may therefore end up at an unfair disadvantage with respect to the preparation of its case.

14. […] [D]uring cross-examination, the party conducting cross-examination can elicit from the witness evidence exceeding the subject-matter of the evidence-in-chief and matters affecting the credibility of the witness, provided that “the witness is able to give evidence relevant to the case for the cross-examining party.”[1] Given that during cross-examination the Defence can elicit from the Prosecution witness information which is relevant to its own case and goes beyond the scope of the Prosecution’s examination-in-chief, the Defence may have a legitimate need to interview this witness prior to trial in order to properly prepare its case.