Section 4 provides for secondments from the Garda Síochána to the PSNI with full police powers for a period not exceeding three years. Secondees will continue to be paid as members of the Garda Síochána but shall not be subject to the direction or control of the Garda Commissioner or be entitled to exercise in the State any Garda powers. Secondees shall continue to be entitled to claim compensation under the Garda Compensation Acts 1941 and 1945 and their service on secondment shall be regarded as service with the Garda Síochána for pension, promotion and seniority purposes. The number and rank of members of the Garda Síochána who may be seconded under this section may be prescribed by regulation under the Bill.