p.s. dont trust armed security guards... 80% of them are whack jobs... I speak from experience, I only allow 2 of my employees to carry on the job.
I spent about 5 years in that business, and worked with about 20 different armed guards. I worked as an armed guard for about 6 months as well.
I'd say 80% is about right from my experience. Out of the 20, I've seen or read reports of at least 18 of those guys drawing their firearms. In only 3 of those cases was it justified. So, 15 of them brandished (or worse). Only 1 was punished by the company.
Due to confidentiality agreements, I won't post a list of names or the company(ies) involved. I'll just say that the 80% applies to the PPOs as well - most of them are crooks and whacks. And don't think that the big corporate security companies are an exception.