“…Despite some negative findings (Cook, Gottfredson, & Na, 2010;Na & Gottfredson, 2011), research on school resource officers has yielded the most promising results. Analyses of national data sets (Jennings, Khey, Maskaly, & Donner, 2011) and case studies in specific environments (Johnson, 1999) suggest that the presence of SROs is correlated with fewer acts of school violence. Studies incorporating multiple crime prevention techniques have also identified several variables as predictors of reduction in school violence including limited class changes (O'Neill & McGloin, 2007), closed campuses (O'Neill & McGloin, 2007), dress codes (Phillips, Turner, & Holt, 2014), identification cards (Phillips et al, 2014), security cameras (GranbergRademacker, Bumgarner, & Johnson, 2007), and uniform policies (Granberg-Rademacker et al, 2007).…”