Practice Relating to Rule 68. Precautions while Receiving Parlementaires
Section B. Detention of parlementaires
Germany’s Military Manual (1992) states:
A parlementaire may be temporarily detained if he has accidentally acquired information the disclosure of which to the adversary would jeopardize the success of a current or impending operation of the friendly armed forces. In this case, the parlementaire may be detained until the operation has been completed.