(a) When a law-enforcement officer observes any respondent abuse the petitioner or minor children or the respondent's physical presence at any location in knowing and willful violation of the terms of an emergency or final protective order issued under the provisions of this article or section 5-509 or 5-608 of this chapter granting the relief pursuant to the provisions of this article, in knowing and willful violation of the terms of a protection order from another jurisdiction that is required to be enforced pursuant to section four, article twenty-eight of this chapter, he or she shall immediately arrest the respondent.
(b) When a family or household member is alleged to have committed a violation of the provisions of section 27-903 or 28-7, a law-enforcement officer may arrest the perpetrator for said offense where:
(1) The law-enforcement officer has observed credible corroborative evidence, as defined in subsection 27-1002(b), that the offense has occurred; and