Two and/or separate options and in both cases identities of school staff carrying or marshals are hidden:
1. Voluntary Concealed Carry - School staff conceal carry all the time
2. School Marshal Program - Part-time marshals with guns locked up
1. Voluntary Concealed Carry:
2/22/18 Los Angeles Times - As gun debate roils on, teachers in this Texas school are already armed -
http://www.latimes.com/nation/la-na-texas-school-armed-20180222-story.html
At Argyle High School, there is a sign posted that states, "Please be aware that the staff at Argyle are armed and may use whatever force is necessary to protect our students."
School board decided to allow staff to be armed after the Sandy Hook Elementary School massacre in 2012.
After the school shooting in Florida, more staff at Argyle High School volunteered to carry guns.
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2. School Marshal Program:
2/24/18 Politico - How Texas is a model for Trump's gun-toting teachers - The state created a program to intensively train and arm "school marshals." Its creator thinks it could well be the inspiration for the president's endorsement of arming educators -
https://www.politico.com/story/2018/02/24/armed-teachers-texas-trump-362397
Texas created a program to train and arm school staff to become "school marshals":
- Must pass background check
- Participants go through active-shooter training
- Guns are kept in a lockbox
- Can only use frangible ammunition
- They are deputized only in active shooting situation