How secure are private correctional systems around the world?

So lately I've been researching private security and correctional service providers for two different - albeit fictional - applications. This research has made me think about privately operated prisons and treatment centers.

Sweden recently had an attempted jailbreak incident where an inmate of an involuntary treatment center was freed by fellow gangsters while in transit to a dentist.

How secure are private correctional systems around the world?

The government agency responsible for involuntary treatment In Sweden is known as the SiS, a Swedish name which can be loosely translated to the National Board of Institutions. The agency has no official English name because it obviously doesn't interact with the public.

How frequent are similar incidents - or jailbreaks in general - in the British, American and Australian systems, where private companies operate facilities like these?

How secure are private correctional systems around the world?
Post Opinion