FOJ, Security > International Mutual Legal Assistance > International Mutual Legal Assistance in Criminal Matters > Extradition, 2015-07-22, no 4 ([Internet, 2019-08-26](https://www.bj.admin.ch/bj/en/home/sicherheit/rechtshilfe/strafsachen/auslieferung.html))
Under the principle of speciality, the extradited person may be prosecuted, held in custody or extradited on to a third state only for those criminal offences that were committed prior to their extradition and on the basis of which the extradition was approved.