The psychological distress generated by having to anticipate being suddenly attacked with deadly force not only effects student performance and well-being in schools but, as is the case with other forms of incarceration, creates an increased potential for long-term dysfunction.
“Anxiety is a psychological, physiological, and behavioral state induced in animals and humans by a threat to well-being or survival, either actual or potential. It is characterized by increased arousal, expectancy, autonomic and neuroendocrine activation, and specific behavior patterns. The function of these changes is to facilitate coping with an adverse or unexpected situation. Pathological anxiety interferes with the ability to cope successfully with life challenges.” (Thierry Steimer, PhD) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3181681/
Eideard 
The psychological distress generated by having to anticipate being suddenly attacked with deadly force not only effects student performance and well-being in schools but, as is the case with other forms of incarceration, creates an increased potential for long-term dysfunction.
“Anxiety is a psychological, physiological, and behavioral state induced in animals and humans by a threat to well-being or survival, either actual or potential. It is characterized by increased arousal, expectancy, autonomic and neuroendocrine activation, and specific behavior patterns. The function of these changes is to facilitate coping with an adverse or unexpected situation. Pathological anxiety interferes with the ability to cope successfully with life challenges.” (Thierry Steimer, PhD) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3181681/