No person, otherwise competent as a witness, is disqualified from testifying as such concerning the offenses defined in Sections 331 to 335, inclusive, of this Article, on the ground that such testimony may incriminate such witness under the provisions defined in said sections, but no prosecution can afterward be had against such witness for any offense defined in said sections, concerning which he testified.
(Added by Ord. 1.075, App. 10/11/38)