Slope chart showing the share of public schools with random metal detector checks, from the 2015-2016 to the 2019-2020 school year. In 2013-14, there were 17.7% in total, with 8.7% of high schools, 7.6% of middle schools and 1.4% of middle schools. By the 2019-2020 school year, there were 26.6% in total, with of 14.8% high schools, 10% of middle schools and 1.8% of elementary schools.