United Kingdom
(1)
The officers of the other States shall, in exercise of their national powers, be permitted in the control zone situated in the host State to detain or arrest persons in accordance with the laws and regulations relating to frontier controls of their own State or persons sought by the authorities of their own State. These officers shall also be permitted to conduct such persons to the territory of their own State.
(2)
However, no person may be held for more than 24 hours in the areas reserved for frontier controls in the host State. Any such detention shall be subject to the requirements and procedures laid down by the legislation of the State of the officers who have made the detention or arrest.