No person otherwise competent as a witness shall be incapacitated, excused, or disqualified from testifying concerning the offense mentioned in any section, chapter, or title of this code, or any ordinances hereafter enacted on the ground that his or her testimony might incriminate him or her, but the testimony which may be given by such witness shall, in no case, be used against him or her.
(Prior Code, § 10-108)