Règle correspondante
Nigeria
Practice Relating to Rule 68. Precautions while Receiving Parlementaires
Nigeria’s Manual on the Laws of War provides: “The force commander (of the other side) … may take security measures to prevent the parlementaire from abusing his privileges for spying.” 
Nigeria, The Laws of War, by Lt. Col. L. Ode PSC, Nigerian Army, Lagos, undated, § 24.
Nigeria’s Manual on the Laws of War states that the “parlementaire can be arrested if he abuses his privileges or succeeds unintentionally in gathering information that may be of benefit to the enemy”. 
Nigeria, The Laws of War, by Lt. Col. L. Ode PSC, Nigerian Army, Lagos, undated, § 24.