Fear Factor

From the 28 page paper by the Sentencing Advisory Council - Does Imprisonment Deter? A Review of the Evidence [PDF] -

Deterrence can be described as the prevention of crime through the fear of a threatened – or the experience of an actual – criminal sanction. General deterrence is aimed at reducing crime by directing the threat of that sanction at all potential offenders. Specific deterrence is aimed at reducing crime by applying a criminal sanction to a specific offender, in order to dissuade him or her from reoffending.

Deterrence is only one of the purposes of sentencing in Victoria, determined by section 5(1) of the Sentencing Act 1991 (Vic). The other purposes are: punishment, denunciation, rehabilitation and community protection (incapacitation). The scope of this paper is limited to examining the sentencing purpose of deterrence only – it does not present an analysis of the evidence of imprisonment’s effectiveness in regard to other sentencing purposes. There is an overlap in some studies when measuring deterrence and incapacitation; however, the paper does not draw conclusions on the effectiveness of imprisonment as a means of reducing crime through incapacitation.

Deterrence theory is based upon the classical economic theory of rational choice, which assumes that people weigh up the costs and benefits of a particular course of action whenever they make a decision. Deterrence theory relies on the assumption that offenders have knowledge of the threat of a criminal sanction and then make a rational choice whether or not to offend based upon consideration of that knowledge.

Rational choice theory, however, does not adequately account for a large number of offenders who may be considered 'irrational'. Examples of such irrationality can vary in severity – there are those who are not criminally responsible due to mental impairment, those who are drug affected or intoxicated and those who simply act in a way that is contrary to their own best interests. Research shows that the majority of offenders entering the Victorian criminal justice system have a history of substance use that is directly related to their offending.

That people are not perfectly rational and do not always make decisions that are in their own best interests is supported by studies in behavioural economics. Behavioural economic theory proposes that individuals make decisions on the basis of imperfect knowledge by employing 'rules of thumb', rather than strict logic, and are subject to limits on their willpower. People are also subject to a great number of patterns of deviation in judgment that occur in particular situations (known as 'cognitive biases'), which influence decision-making in predictable – but often irrational – ways.

The evidence from empirical studies of deterrence suggests that the threat of imprisonment generates a small general deterrent effect. However, the research also indicates that increases in the severity of penalties, such as increasing the length of terms of imprisonment, do not produce a corresponding increase in deterrence.

It has been suggested that harsher penalties do not deter because many crimes are committed in circumstances where it is difficult to identify when, or if, offenders have considered the consequences of their criminal behaviour. In addition, otherwise rational individuals are more strongly influenced by the perceived immediate benefits of committing crime and individuals ‘discount’ the cost of future penalties.

A consistent finding in deterrence research is that increases in the certainty of apprehension and punishment demonstrate a significant deterrent effect. Perceptions about the certainty of apprehension, for example, may counter the ‘present bias’ and reinforce the potential cost of committing crime. This result is qualified by the need for further research that separates deterrable from non-deterrable populations.

Research into specific deterrence shows that imprisonment has, at best, no effect on the rate of reoffending and often results in a greater rate of recidivism. Possible explanations for this include that: prison is a learning environment for crime, prison reinforces criminal identity and may diminish or sever social ties that encourage lawful behaviour and imprisonment is not the appropriate response to many offenders who require treatment for the underlying causes of their criminality (such as drug, alcohol and mental health issues). Harsh prison conditions do not generate a greater deterrent effect, and the evidence shows that such conditions may lead to more violent reoffending.

The empirical evidence on the effectiveness of imprisonment as a deterrent to crime suggests that the purposes of sentencing should be considered independently – according to their own merits – and that caution should be exercised if imprisonment is to be justified as a means of deterring all crimes and all kinds of offenders.