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Poland
Practice Relating to Rule 158. Prosecution of War Crimes
Poland’s Penal Code (1997), in a specific part entitled “Offences against peace, humanity and war offences”, provides for the punishment of certain acts, some of them when committed “during hostilities” or “in violation of international law”, such as internationally prohibited acts against certain specific protected persons – including persons “who, during hostilities, enjoy international protection” – and objects, as well as the use of means or methods of combat prohibited by international law. 
Poland, Penal Code, 1997, Articles 117–126.
Poland’s Refugee Status Act (2003), as amended to 2008, states:
Art. 19.1. A foreigner is denied the status of a refugee if:
3) there are substantial grounds to assume that:
a) he/she has committed a crime against peace, a war crime or crime against humanity within the meaning of international law …
2. The status of a refugee is also denied in case of foreigners against whom there are substantial grounds for believing that they allegedly instigated or otherwise were involved in crimes or acts referred to in subparagraph 1 item 3.
Art. 20.1. A foreigner is denied assistance and supplementary protection if:
2) there are substantial grounds to assume that:
a) he/she is guilty of accusations enumerated under art. 19 subparagraph 1 item 3 letter a …
2. Assistance and supplementary protection may also be denied in case of foreigners against whom there are substantial grounds for believing that they allegedly instigated or otherwise were involved in crimes or acts referred to in … art. 19 subparagraph 1 item 3 letter a.
Art. 21.1. A foreigner may be deprived of the status of a refugee if, upon granting such status, a relevant authority has stated that the foreigner:
7) committed a crime against peace, a war crime or a crime against humanity within the meaning of international law.
Art. 22.1. A foreigner may be deprived of the foregoing supplementary protection if:
2) upon such protection having been provided, circumstances referred to in art. 19 subparagraph 1 item 3 letter a … occurred. 
Poland, Refugee Status Act, 2003, as amended to 2008, Articles 19–22.
The Act further states:
Art. 106.1. Foreigners who come to the territory of the Republic of Poland in great numbers (mass migration) escaping their country or specific geographical area due to alien invasion, war, civil war, ethnic conflicts … may be granted temporary protection in Poland without regard to whether their arrival was spontaneous or was the result of assistance provided by the Republic of Poland or international community.
Art. 109. The Head of the Foreigners’ Office may refuse a foreigner the temporary protection as above, if:
1) there are well-founded grounds to suspect that:
a) they committed a crime against peace, a war crime or a crime against humanity within the meaning of international law relating to the foregoing crimes. 
Poland, Refugee Status Act, 2003, as amended to 2008, Articles 106(1) and 109(1)(a).