A google search turns up all kinds of Texas security agencies that offer both armed and unarmed security officers. Armored car drivers are not off-duty policemen, for example.
My bad! I never considered armored car drivers as security guards.
I just asked the house genius, he said there are two ratings of security guards - those that can carry and those that can't (duh!). Kinda like you said in one of the above post.
Damn, I hate being wrong!!