A security guard has testified that Nikolas Cruz was such a threat when he attended Marjory Stoneman Douglas High School that he was searched for weapons every morning. Cruz is accused of returning to the Parkland, Florida, school on Valentine’s Day 2018 and killing 14 students and three educators. Kevin Greenleaf testified that 20-year-old Cruz was barred from bringing a backpack on campus after talking of suicide and writing “kill” in a notebook.