Practice Relating to the Use of Prohibited Weapons
Poland’s Penal Code (1997) punishes for a war crime “any person who, against the prohibition by international law or by the provisions of law, produces, stockpiles, acquires, sells, retains, transports or sends … means of warfare, or conducts research aimed at the production or use of such means”. 
Poland, Penal Code, 1997, Article 121(1).