No, I doubt that will happen.
Knowing where the school is, I suspect the SRO is a policeman. Possibly plain clothes, possibly not.
MD is not a gun friendly environment.
I have relatives who live there. I have no interest in going there.
>> MD is not a gun friendly environment <<
But St. Marys County is not typical of the state. It’s a conservative area, with lots of navy personnel, Amish and former tobacco farmers.