Section 25: Indemnity of persons appearing.

(1) Subject to the provisions of section 20 of this Act, any witness appearing in the requested country in response to a request under section 18 of this Act or persons transferred to that country in response to a request under section 18 of this Act shall be immune in the requesting country from prosecution, detention or any other restriction of personal liberty in respect of criminal acts, omissions or convictions before the time of the departure of the witness from the requested country.
(2) The immunity conferred under subsection (1) of this section shall cease-
(a) in the case of a witness appearing in response to a request under section 17 or 18 of this Act, when the witness having had for a period of fifteen consecutive days after the date when the witness had been notified by the appropriate authority that his presence was no longer required and having afforded him the opportunity to leave the country, he has continued to remain in the requesting country or having left it, has returned to it; and
(b) in the case of a person in custody transferred in response to a request under section 19 of this Act and remaining in custody, when he has been returned to the requested country.