For a recording, complete documentation and prior information are central.
Under section 97 StPO, an examination may be recorded as audio or audio and video after the person being examined has been expressly informed, provided that the examination is recorded in full. For witnesses, the recording must stop once the witness objects, subject to special statutory provisions.
Before the examination begins, ask whether a recording will be made, what its purpose is and how the statement will be documented. For an accused person, the caution, the right to silence and the right to a lawyer under section 164 StPO remain decisive.