I find this article a little biased, to an outside observer it is written as if the state was insidiously holding people against their will. There are actual mistakes made like with any human run enterprise, but you didn't mention that 90% of these "overstays" are for inmates with long rap sheets who rotate in and out of the system bi-yearly if not bi-monthly. When you get "good time" for good behavior and programming which is sometimes 50% off an inmates court ordered sentence, it can be taken back for behavioral write-ups or negative drug test, ect. A lot of the ombudsmen complaints are for inmates who demand the maximum amount of good time be credited to their sentence, and are pissed they aren't getting out at the earliest possible date.