What is the difference between Public and Private Security Guard Services?

[BrooklynMartin]

What is the difference between Public and Private Security Guard Services?

[damponting44]

Public Security Gaurd services:
As you might expect, public police departments are local, county, state or federal government entities. Because of their government affiliations:

    Public police adhere to rigid training and certification requirements.
Private Security Guard services:
In private security, service contracts are negotiable, from client to client.
Without government restrictions, private security personnel can focus on specific client security more effectively and efficiently than police departments.