Section 809A.19 - Immunity orders1. If a person is or may be called to produce evidence at a deposition, hearing, or trial under this chapter or at an investigation brought by the prosecuting attorney under section 809A.18, the district court in which the deposition, hearing, trial, or investigation is or may be held shall, upon certification in writing of a request of the prosecuting attorney, issue an order, ex parte or after a hearing, requiring the person to produce evidence, notwithstanding that person's refusal to do so on the basis of the privilege against self-incrimination.2. The prosecuting attorney may certify in writing a request for an ex parte order under subsection 1 if in the prosecuting attorney's judgment both of the following apply: a. The production of the evidence may be necessary to the public interest.b. The person has refused or is likely to refuse to produce evidence on the basis of the privilege against self-incrimination.3. A person shall not refuse to comply with an order issued under subsection 1 on the basis of a self-incrimination privilege. If the person refuses to comply with the order after being informed of its existence by the presiding officer, the person may be compelled or punished by the district court issuing an order for civil or criminal contempt.4. The production of evidence compelled by order issued under subsection 1, and any information directly or indirectly derived from the production of evidence, shall not be used against the person in a subsequent criminal case, except in a prosecution for perjury, false swearing, or an offense otherwise involving a failure to comply with the order.