1. Evidence received by the senate or house may be either by depositions taken pursuant to section 115.569 or by witnesses subpoenaed for personal appearance before the senate or house.
2. No testimony shall be received in the taking of depositions which does not relate to the points specified in the notices.
3. All testimony taken shall be certified by the persons appointed to take the depositions to the president of the senate or to the speaker of the house, as the case may be.