Prison overcrowding is one of the key contributing factors to poor prison conditions around the world (Williams and Arrigo, 2012). It is arguably the biggest single problem facing the prison systems. The consequences can be life-threatening at worst and at best when preventing prisons from fulfilling their proper function. Data from 2016, suggested that the number of prisoners exceeded official prison capacity in at least 115 countries (Lawaspect, 2018). On the other hand, 51 countries had a problem of extreme overcrowding (Lawaspect, 2018). As a result, the overuse of solitary confinement in prisons around the world is becoming an increasing concern. Some form of short-term isolation from the rest of the prison population is used almost everywhere
