21.— (1) A direction or order under section 17 ceases to have effect on the cessation of an investigation into whether the service or transaction the subject of the direction or order would, if it were to proceed, comprise or assist in money laundering or terrorist financing.

(2) As soon as practicable after a direction or order under section 17 ceases, as a result of subsection (1), to have effect, a member of the Garda Síochána shall give notice in writing of the fact that the direction or order has ceased to have effect to—

(a) the person to whom the direction or order has been given, and

(b) any other person who the member is aware is affected by the direction or order.