Dallas school shooting: District investigating how gun got into Wilmer-Hutchins High

Dallas ISD is working to find out how a teenager brought a gun onto campus. Wilmer-Hutchins High School has metal detectors and the district has a new policy this year that requires students to have a clear backpack. FOX 4 talked to an expert about the vulnerabilities at schools that could have let that happen. Subscribe to FOX 4: https://www.youtube.com/fox4news?sub_confirmation=1 Dallas news, weather, sports and traffic from KDFW FOX 4, serving Dallas-Fort Worth, North Texas and the state of Texas. Download the FOX LOCAL app: fox4news.com/foxlocal Watch FOX 4 Live: https://www.fox4news.com/live Download the FOX 4 News App: https://www.fox4news.com/apps Download the FOX 4 WAPP: https://www.fox4news.com/apps Follow FOX 4 on Facebook: https://www.facebook.com/Fox4DFW/ Follow FOX 4 on Twitter: https://twitter.com/FOX4 Follow FOX 4 on Instagram: https://www.instagram.com/fox4news/ Subscribe to the FOX 4 newsletter: https://www.fox4news.com/newsletters