Commentaries: Art. 155

Before each hearing, it must be established whether a person is to be interviewed as a person providing information or as a formal witness.
The formal interviewing of witnesses shall be ordered only if the facts of the case cannot be sufficiently clarified by another means. Any person summoned is obliged to testify.
If an investigation is directed solely or mainly towards one person, that person may be interviewed only as a person providing information.
Witnesses must be reminded of their duty to give evidence and their obligation to tell the truth, and persons providing information of their right to refuse to give information. The right to refuse to testify in terms of Article 42 paragraph 1 of the Federal Act of 4 December 1947^¹^on Federal Civil Procedure is reserved.
In order to maintain a record of the proceedings, the hearings shall be recorded on audio tape. The transcript of the tape shall be signed by the persons interviewed.
Articles 166–171 apply in respect of the procedure and the rights of the persons concerned.

Art. 155