Règle correspondante
Practice Relating to Rule 161. International Cooperation in Criminal Proceedings
Section C. Extradition of own nationals
Switzerland’s Federal Act on International Mutual Assistance (1981), as amended to 2010, states:
1. No Swiss national may, without his written consent, be extradited or surrendered to a foreign State for prosecution or for the execution of a sentence. Consent may be withdrawn up to the time when the surrender is ordered.
2. Paragraph 1 does not apply to transit or return of a Swiss national who is temporarily surrendered by a third State to the Swiss authorities. 
Switzerland, Federal Act on International Mutual Assistance, 1981, as amended to 2010, Article 7.