# The Channel Tunnel (International Arrangements) Order 1993, 

Extent: E+W+S+N.I.

(1) The officers of the adjoining State 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 the adjoining State or persons sought by the authorities of the adjoining State.These officers shall also be permitted to conduct such persons to the territory of the adjoining State.
(2) However, except in exceptional circumstances, no person may be held more than 24 hours in the areas reserved, in the host State, for the frontier controls of the adjoining State.Any such detention shall be subject to the requirements and procedures laid down by the legislation of the adjoining State.
(3) In exceptional circumstances the 24 hour period of detention may be extended for a further period of 24 hours in accordance with the legislation of the adjoining State.The extension of the period of detention shall be notified to the authorities of the host State.

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Source: https://www.legislation.gov.uk/uksi/1993/1813/schedule/2/part/II/crossheading/6 (the official version)
Page: https://openlegislation.uk/channel-tunnel-international-arrangements-order-1993/schedule-2/part-II/crossheading-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.