the statements of witnesses or experts shall be affirmed in the form prescribed by the laws of the requesting State, even if the applicable Swiss law does not provide such a form;
b.
forms necessary to obtain other evidence that is admissible in court may be taken into consideration.
2 Forms for obtaining and affirming evidence according to paragraph 1 must be compatible with Swiss law, and no essential prejudice may result therefrom to the persons involved.
3 A person may also refuse to testify provided the law of the requesting State so provides or if the fact of testifying may cause criminal or disciplinary sanctions to be imposed under the laws of that State or of the State where the examined person lives.
109 Amended by No I of the FA of 4 Oct. 1996, in force since 1 Feb. 1997 (AS 1997114; BBl 1995 III 1).