These "marshals" will be teachers or administrators or others already employed by the district who volunteer for the program, and if accepted, will receive training. This training is not equivalent to the training licensed police officers receive.
No one will know, other than administration, who these "marshals" are. In theory anyway. They are expected to keep the gun on them at all times, not locked in a desk or a closet or a safe or whatever.
These marshals can replace or be in addition to any other security (SROs, off duty cops, whatever) the district already uses.
This is something that the TEA has come up with (god help us), and districts can implement if they so desire.
I know all this because my daughter's district is thinking about implementing this program, and they had a community presentation about it. The above is what I remember from the presentation.
now, over/under on the number of days until a school marshal has an accidental discharge, or leaves the gun unsecured? Anybody?
edit: after careful perusal of the OP, it seems there are some differences in what my district is considering and what San Marcos is implementing. The marshal or marshals in my district would most likely be teachers or administrators (again, god help us).
edit again:
The marshals’ responsibilities would include patrolling the campuses, performing safety checks and audits, and conducting safety training drills...
The plan calls for each school marshal to carry a concealed handgun and for their identity to be confidential, according to school board documents.
Not sure how they would remain anonymous if they are conducting safety drills and performing audits.