Chapter IV#Section II: Organisation of Control - Art. 23.
Protecting Power, Delegates.
Article 23.- The High Contracting Parties recognise that the full execution of the present Convention implies the cooperation of Protecting Powers; they declare themselves ready to accept the good offices of these Powers.
To this end, the Protecting Powers may nominate delegates, apart from their diplomatic staff, among their own nationals or among the nationals of other neutral Powers. These delegates shall be subject to the agreement of the belligerent to which their mission accredits them.
The representatives of the Protecting Power or its accepted delegates shall be authorised to visit all places of civilian internment, without exception. They shall have access to all buildings occupied by civilian internees and be allowed to converse with them, as a general rule without witnesses, personally or by the intermediary of interpreters.
The belligerents shall facilitate to the greatest possible extent the task of the representatives or of the recognized delegates of the Protecting Power. The military authorities shall be informed of their visits.
The belligerents may agree between themselves to allow persons of the same nationality as that of the civilian internees to participate in the journeys of inspection.