Here is a sample to the contrary:
http://news.abs-cbn.com/nation/regions/11/28/14/student-accidentally-shot-security-guard
http://www.guns.com/2013/05/15/student-accidently-shot-by-armed-security-guard/
http://www.cnn.com/2002/US/Southwest/10/31/tulsa.shooting/index.html?_s=PM:US
I can go on from here.