23. The witnesses shall testify after having been sworn by the coroner and, if he so requires, out of each other’s presence. Any person able to testify may be compelled to do so under the penalties provided respecting witnesses who refuse to answer before the Superior Court.
A witness cannot refuse to answer for the reason that his reply might tend to incriminate him or to expose him to a proceeding of any kind; but his replies cannot be used against him in any subsequent criminal proceedings, except for perjury.