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Switzerland
Practice Relating to Rule 65. Perfidy
Section A. General
III. Military Manuals
Switzerland’s Basic Military Manual (1987) states: “Ruses of war based on treachery and perfidy are prohibited.” 
Switzerland, Lois et coutumes de la guerre (Extrait et commentaire), Règlement 51.7/II f, Armée Suisse, 1987, Article 39(1).
Switzerland’s Regulation on Legal Bases for Conduct during an Engagement (2005) states:
15.2 Prohibited methods of warfare
…
223 Misuse of a distinctive sign and the feigning of protected status are prohibited in any place and at any time. Examples: … using the white flag to feign surrender and then opening fire on the approaching enemy … . 
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, § 223.
VI. Other National Practice
In 2005, in a report in response to a parliamentary postulate on private security and military companies, Switzerland’s Federal Council stated: “International humanitarian law also limits the conduct of military operations permissible under international law. … Certain methods such as perfidiousness … are excluded.” 
Switzerland, Report by the Swiss Federal Council on Private Security and Military Companies, 2 December 2005, section 5.3.1, pp. 45–46.
Switzerland’s ABC of International Humanitarian Law (2009) states:
Means and methods of warfare
Even in war not everything is allowed. Various means and methods are prohibited, including Perfidy, …
Perfidy
International humanitarian law prohibits killing, injuring or capturing an adversary by resorting to perfidy. Acts of perfidy include any form of deception designed to win the confidence of an adversary and lead him to believe that he is entitled or obliged to accord protection under the rules of international humanitarian law, with the intention of betraying that confidence. An example of perfidy is to falsely lay claim to protected status through the misuse of signs or emblems and feigning incapacitation on the grounds of injuries or sickness. 
Switzerland, Federal Department of Foreign Affairs, ABC of International Humanitarian Law, 2009, pp. 29 and 34.