Соответствующая норма
Practice Relating to Rule 88. Non-Discrimination
Section D. Persons deprived of their liberty
Switzerland’s Basic Military Manual (1987) recalls: “No adverse distinction can be based on race, nationality, religion, political opinions, language, colour, social condition, birth or other similar criteria.” 
Switzerland, Lois et coutumes de la guerre (Extrait et commentaire), Règlement 51.7/II f, Armée Suisse, 1987, Article 97.
Switzerland’s Regulation on Legal Bases for Conduct during an Engagement (2005) states:
Prisoners must be humanely treated at any time and in any place. Any act of torture, physical or mental ill-treatment, degrading treatment or discrimination as well as measures of reprisal are prohibited. The State is responsible for the treatment of prisoners; each individual may be held liable for violations. 
Switzerland, Bases légales du comportement à l’engagement (BCE), Règlement 51.007/IVf, Swiss Army, issued based on Article 10 of the Ordinance on the Organization of the Federal Department for Defence, Civil Protection and Sports of 7 March 2003, entry into force on 1 July 2005, § 187.
[emphasis in original]
In 2010, in its Report on IHL and Current Armed Conflicts, Switzerland’s Federal Council stated:
3.4 [Increasing use] of anti-guerrilla tactics
Apart from the direct fight against insurgents, international humanitarian law also addresses other anti-guerrilla tactics. … If members of militias or opposition groups fall into the hands of the government they benefit from the protection of art. 75 of [the 1977] Additional Protocol I as well as that of art. 3 common to the [1949] Geneva Conventions. 
Switzerland, Federal Council, Report on IHL and Current Armed Conflicts, 17 September 2010, Section 3.4, p. 15.
[footnotes in original omitted]
In 2012, Switzerland’s Federal Department of Foreign Affairs issued a press release entitled “Appeal by the Swiss authorities for compliance with international humanitarian law in Syria”, which stated: “Persons who are not or no longer taking part in the hostilities must be treated humanely without any discrimination. This is especially important in the case of detainees.” 
Switzerland, Federal Department of Foreign Affairs, “Appeal by the Swiss authorities for compliance with international humanitarian law in Syria”, Press Release, 15 November 2012.