google is awesome
20% is 710,000 teachers to be trained and armed
according to this the average police officer spends 60 hours a year on firearm training, that is a lot of overtime for teachers
https://www.vox.com/2016/7/7/12118906/police-training-mediation
I also saw that the average for hitting the target in a gun fight for NYPD was around 34%
http://www.nytimes.com/2008/05/08/nyregion/08nypd.html
if we can get teachers that good (and we can't) they are missing their target 2/3 shots fired. So what will we be hitting, in schools