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Chad
Practice Relating to Rule 65. Perfidy
Section E. Simulation of an intention to negotiate under the white flag of truce
Chad’s Instructor’s Manual (2006) states that the “perfidious use of protective signs” is a grave breach of the 1977 Additional Protocol I and, as such, a war crime. 
Chad, Droit international humanitaire, Manuel de l’instructeur en vigueur dans les forces armées et de sécurité, Ministère de la Défense, Présidence de la République, Etat-major des Armées, 2006, p. 108.
Chad’s Emblem Law (2014) states:
Any person who, intentionally, in time of war, commits or gives the order to commit acts resulting in the death of or causing serious harm to the body or health of an adversary by making perfidious use of the emblem of the red cross or red crescent or a distinctive signal, commits a war crime and is punished by forced labour.
Perfidious use means improperly using the distinctive emblem of the red cross, red crescent or other protective signs recognized by international humanitarian law, or improperly using the badge of a parlementaire, the flag or military insignia and uniform of the enemy, or of the United Nations, and by doing so, causing the loss of human lives or serious injuries. 
Chad, Emblem Law, 2014, Article 11.