The unpleasant prison experience is designed to put off the individual from re-engaging in offending behaviour. Deterrence works on two levels: (i) general deterrence which aims to send a broad message to members of a society that crime will not be tolerated, (ii) Individual deterrence should prevent recidivism (re-offending) in light of their experience.
The idea behind retribution is that society is taking revenge for the crime by making the offender suffer, and the level of suffering should be proportionate to the seriousness of the crime. It is based on the idea that the offender should, in some way pay for their actions.
The idea behind confinement, is that the offender is taken out of society, to prevent reoffending (recidivism) in the future, as a means of protecting the public. The need for confinement is likely to depend upon the severity of the offence and the nature of the offender.
Some people believe that the main objective of prison is to reform. Upon release, offenders should leave prison better adjusted and ready to take their place back in society. Prison should provide opportunities to develop skills and training, or to access treatment programmes for drug addiction, as well as give the offender the chance to reflect on their crime. This serves to try to reduce recidivism and protect society from future crimes being committed by the offender.
If recidivism rates are high, this is a concern for society, as it has implications for the aims of custodial sentencing and suggests that current treatment programmes (e.g. behaviour modification and anger management) in prisons do not necessarily work, because recidivism is used as a measure of the effectiveness of custodial sentencing.
Prison might make someone more likely to engage in criminal behaviour. For example, whilst in prison, people might meet drug dealers with whom he or she can network, or might have to behave in a highly aggressive way to avoid being assaulted in prison
Being in prison can interfere with a person's ability to obtain gainful employment both because of the person's criminal record and because time in prison is time away from employment and the opportunity to gain skills.
Prison may not remedy the factors that caused a person to engage in criminal activity in the first place. In some cases, being in prison can make these problems worse. For example, a person with mental illness might not receive treatment in jail, causing their mental health issues to become worse. A significant proportion of the prison population has some type of mental health condition.
Davis and Raymond (2000): 'Prison sentences are only issued to satisfy society in order to make it look like something is being done by the criminal justice system; therefore, the root causes of crime are not addressed'
According to a Ministry of Justice survey, many prisoners have pre-existing mental health problems (16% male prisoners, 26% of female) and many more develop them in prisons
Estimates show that nearly half (48%) of female prisoners) and almost a quarter (23%) of male prisoners suffer from anxiety and depression, possibly because of the stress caused by overcrowding and the loss of freedom