Iowa Code Title XVI. Criminal Law and Procedure [Chs. 687-916] § 720.4. Tampering with witnesses or jurors

A person who offers any bribe to any person who the offeror believes has been or may be summoned as a witness or juror in any judicial or arbitration proceeding, or any legislative hearing, or who makes any threats toward such person or who forcibly or fraudulently detains or restrains such person, with the intent to improperly influence such witness or juror with respect to the witness' or juror's testimony or decision in such case, or to prevent such person from testifying or serving in such case, or who, in retaliation for anything lawfully done by any witness or juror in any case, harasses such witness or juror, commits an aggravated misdemeanor.