CHAPTER IV: OTHER FORMS OF COOPERATION
SECTION II: SPECIFIC FORMS OF COOPERATION
Art. 39 Temporary transfer of persons in detention
1 Persons not accused by the Court who are in detention in Switzerland may be transferred temporarily to the Court for purposes of identification, questioning, confrontation, or other investigative acts, if the person consents in full knowledge of the circumstances.
2 The Court shall grant the transferred person safe-conduct, keep the person in detention, and give assurances that the person will be returned once the purpose of the transfer is satisfied.
EDIT.