PART V—DOMESTIC PROCEDURES FOR OTHER TYPES OF CO-OPERATION
Service of Documents and Appearance of Witnesses
87. (1) Where the ICC requests assistance under paragraph 8 of article 19, article 56, paragraph 7 of article 58, article 64 or paragraph 1 (e) of article 93 of the Rome Statute in facilitating the voluntary appearance of a witness before the ICC, the Attorney-General may give authority for the request to proceed if he is satisfied that—
(a) the request relates to an investigation being conducted by the Prosecutor or any proceedings before the ICC; and
(b) the witness's attendance is sought so that the witness can give evidence or information relating to the investigation or proceedings; and
(c) the witness is or may be in Kenya.
(2) In this section and sections 88 and 89, "witness" includes a person who may give expert evidence, but does not include a person who has been accused of an international crime in the proceedings to which the request related
Facilitating voluntary appearance of persons - national procedures for ICC proceedings
EDIT.