Iowa Code § 135.42: Unlawful use.

All information, interviews, reports, statements, memoranda, or other data furnished in accordance with this subchapter and any findings or conclusions resulting from such studies shall not be used or offered or received in evidence in any legal proceedings of any kind or character, but nothing contained in this subchapter shall be construed as affecting the admissibility as evidence of the primary medical or hospital records pertaining to the patient or of any other writing, record or reproduction thereof not contemplated by this subchapter.