Honestly my guess would be that it's primarily private security, as an arm of a corp, or a corp that exists exclusively for security or something along those lines, like a PMC. Is that the case? Is there no municipal police force? Surely smaller areas still rely on that sort of policing if there's any, but if I wanted to have a character that was a former police officer in Neo York or Boston, it would almost HAVE to be as corp-cop, so to speak?