Section 617.97 - USE OF PLACE; EVIDENCE(a) In an action brought under sections 617.91 to 617.97, proof that gang activity by a member of a criminal gang is continuously or regularly committed at a place or proof that a place is continuously or regularly used for engaging in gang activity by a member of a criminal gang is prima facie evidence that the person who owns or is responsible for maintaining the place knowingly permitted the act.(b) Paragraph (a) does not apply if the person who owns or is responsible for maintaining the place proves, by a preponderance of the evidence, that the person has made reasonable efforts to prevent the occurrence of the gang activity, which may include cancellation of or an attempt to cancel the lease.