Section II-27: Witnesses not excused from testifying - Immunity from prosecution.

  Any person having knowledge or possession of facts that tend to
establish the guilt of any other person or corporation under the
laws of the state shall not be excused from giving testimony or
producing evidence, when legally called upon so to do, on the
ground that it may tend to incriminate him under the laws of the
state; but no person shall be prosecuted or subjected to any
penalty or forfeiture for or on account of any transaction,
matter, or thing concerning which he may so testify or produce
evidence.  All other provisions of the Constitution or the laws
of this state in conflict with the provisions of this
constitutional amendment are hereby expressly repealed.