I read this OpEd piece today, and it captures many of the discussions
I've had with people during the last month.
I highly recommend Charlie Schnabolk's book, Physical Security: Practices
and Technology. Its one of several I've found very helpful in trying
to understand security. Hiring ex-cops is one facet of security, but
there is more to security than big guys with guns. In today's world
you need a multi-disciplinary group handling security.