Chapter 2
Provision of assistance
Section 10
Presence
The competent authority of the requesting State, the parties as well as any other interested persons shall have the right to be present in accordance with Finnish law when witnesses, experts or parties are heard or another requested measure is carried out. An authority of the requesting State may, subject to the consent of the court or the pre trial investigation authority, participate in court proceedings and the pre trial investigation as well as put questions to the persons being examined.
On the request of an authority of the requesting State, the authority of the requesting State shall be notified of the time and place of the execution of requested measure well in advance, so that the authority, the parties and other interested persons may be present.
Fair trial standards
Questioning of persons - national procedures for ICC proceedings
EDIT.