https://news.vice.com/en_us/article/43jw33/people-in-detroit-are-hiring-paramilitary-guards-because-theyve-lost-faith-in-government
Where things get interesting is when you look into why it is they are becoming necessary and start speculating as to whether or not it is a trend that will continue. These private security firms are necessary on the streets due to failings of the city/state to provide a necessary service and are stepping in to fill that void. If the trend is extrapolated and state police continue to struggle then there is a genuine chance these private entities will become the de-facto police, a corporate police force for hire.