Three years after a gunman killed 19 students and two teachers at Robb Elementary School, the Uvalde Consolidated Independent School District is implementing artificial intelligence technology to detect firearms and trigger immediate lockdowns. NewsNation's Ali Bradley has more. Anchor Elizabeth Vargas delivers the biggest stories, without bias or opinion. Watch "Elizabeth Vargas Reports" every weeknight at 7p/6C on NewsNation. #VargasReports NewsNation is your source for fact-based, unbiased news for all Americans. More from NewsNation: newsnationnow.com Get our app: trib.al/TBXgYpp Find us on cable: trib.al/YDOpGyG How to watch on TV or streaming: trib.al/Vu0Ikij