Madison police chief on ‘UpFront’ says gun used in school shooting purchased legally

Madison Police Chief Shon Barnes says the guns brought to school by a 15-year-old school shooter in Madison last week were bought legally, but the chief wouldn't reveal who bought them. "Those firearms have been traced from our partners with the ATF," Barnes said on WISN's “UpFront,” which is produced in partnership with WisPolitics. "They did an emergency trace for us and was able to get that inf...