尽管这些数字是高,有理由相信实际数字可能更高。称为不代表所有的人可能重犯。Lipsey Landenberger &查普曼(2003),例如,指出匿名自我报告的研究经常发现较高的犯罪率比官方称为统计显示。Spicer & Glicksman(2004)指出,然而,自我报告的研究依赖于被申请人的诚信,所以有自己的缺陷。进一步批评被Lipsey Landenberger &查普曼(2003),称为利率数字-一个人要么是是否会再次被判入狱,而事实是,任何康复的影响可能导致更严重的罪行。称为应该也不是唯一衡量的结果,还有其他重要的方面一个人的生活,可以表明他们的康复程度,例如他们的就业状况和心理健康。尝试的上下文的康复疗法是由下议院内政委员会概述(HCHAC,2004)。监狱人口快速上升增加了25000名囚犯在英格兰和威尔士2004年之前的十年。2004年4月,监狱人口达75544(HCHAC,2004),最高的数字,实际上的最高利率在欧洲的人均监禁。这无疑导致创纪录水平过度拥挤的监狱,与82年139年在英格兰和威尔士的监狱过度拥挤。HCHAC(2004)认为监狱过度拥挤是面临的最大问题之一的康复计划,这种情况可能会持续相当长的时间。
Despite these numbers being high, there is reason to believe the actual figures might be higher still. Reconvictions do not represent all the people that might reoffend. Lipsey, Landenberger & Chapman (2003), for example, point out that anonymous self-report studies frequently find higher rates of reoffending than the official reconviction statistics suggest. Spicer & Glicksman (2004) point out, however, that self-report studies rely on the honesty of the respondent, and so have their own flaws. A further criticism identified by Lipsey, Landenberger & Chapman (2003) is that reconviction rates are digital - a person was either reconvicted or not - whereas the reality is that the effect of any rehabilitation may cause less serious offences to be committed. Reconviction should also not be the only measure of outcome - there are other important aspects of a person's life that can indicate their degree of rehabilitation, for example their employment status and mental health.The context in which attempts at rehabilitation are made is outlined by the House of Commons Home Affairs Committee (HCHAC, 2004). The prison population is rising quite rapidly with an increase of 25,000 prisoners in the decade preceding 2004 in England and Wales. In April 2004 the prison population stood at 75,544 (HCHAC, 2004), the highest ever figures, indeed the highest rates of incarceration per head of population in Europe. This has unsurprisingly lead to record levels of overcrowding in prisons, with 82 of the 139 prisons in England and Wales suffering from overcrowding. The HCHAC (2004) see prison overcrowding as one of the biggest problems facing the delivery of rehabilitative programmes and a situation that is likely to continue for some considerable time.