Related Rule
Italy
Practice Relating to Rule 72. Poison and Poisoned Weapons
Italy’s IHL Manual (1991) states: “It is specifically prohibited … to use poison or poisoned weapons.” 
Italy, Manuale di diritto umanitario, Introduzione e Volume I, Usi e convenzioni di Guerra, SMD-G-014, Stato Maggiore della Difesa, I Reparto, Ufficio Addestramento e Regolamenti, Rome, 1991, Vol. I, § 8(1).
Italy’s Law of War Decree (1938), as amended in 1992, provides: “It is prohibited … to use poison or poisoned weapons.” 
Italy, Law of War Decree, 1938, as amended in 1992, Article 35(1).