Related Rule
Luxembourg
Practice Relating to Rule 90. Torture and Cruel, Inhuman or Degrading Treatment
Under Luxembourg’s Law on the Repression of War Crimes (1947), “acts of violence and cruelty committed against prisoners of war, detainees, deportees, accused, witnesses or persons compelled to work” constitute war crimes. 
Luxembourg, Law on the Repression of War Crimes (1947, Article 2(3).
Luxembourg’s Law on the Punishment of Grave Breaches (1985) provides that torture or inhuman treatment, wilfully causing great suffering or injuries to the physical and mental integrity or health of protected persons, constitute grave breaches of the 1949 Geneva Conventions. 
Luxembourg, Law on the Punishment of Grave Breaches (1985, Article 1(1)–(2).