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How do crimes move through the criminal justice system?

to be continued
The Royal Courts of Justice
© The University of Sheffield
On the previous step, we learned how a crime goes from arrest to trial, but not all crimes that are recorded by the police will make it this far through the criminal justice process.
There is an ever-decreasing proportion of cases, as they move through the criminal justice system. For example, of those cases which are reported to the police, not all result in a prosecution. Similarly, not all prosecutions end in convictions. This dropping off of cases as they move through the various points in the criminal justice process is known as attrition. Therefore, the CJS can be viewed as like a funnel.

The criminal justice funnel

The image below illustrates this attrition and the funnel-like nature of the criminal justice process. A large number of cases go into the system at the top, based on crimes reported and then recorded by the police, but fewer and fewer cases make it to the end of the system i.e. with a conviction at court and some form of punishment.
In 2016, 4,164,619 (notifiable) offences were recorded by the police and 89,812 defendants were sentenced to prison.
A funnel shaped diagram that details the declining number of cases dealt with at different stages of the criminal justice process. At the top, 4,164,619 cases are recorded by the police, below this, 284,955 are resolved out of court, 3,657,714 are proceeded against at Magistrates' courts, 1,155,917 are sentenced by Magistrates and 82,118 Sentenced by Crown Court, 159,255 are sentenced to serve in the community, 89,812 are sentenced to custody. At the bottom of the funnel 127,634 cases end in probation and 67,524 with prison. Flows through the criminal justice system in 2016
This diagram is based on a more detailed flowchart created by the Ministry of Justice. If you’d like to take a look at this flowchart, you can find it on page 6 of this report.
The attrition of cases happens for a variety of reasons. Some cases may lack the necessary evidence to proceed either to charge or conviction.
There may also be procedural irregularities, such as in the way that the police treated suspects, which may require certain evidence to be excluded at court and which may undermine a conviction.
In light of austerity and the cuts to the budgets of criminal justice institutions discussed earlier this week, criminal justice actors may lack the time and resources to investigate cases properly or to review the evidence thoroughly.
A key factor driving attrition, however, is the discretionary power of criminal justice actors. This is their “authorised capacity to make choices about different courses of action or inaction, which are structured by and structuring of the legal and administrative rules, as well as the wider cultural and social structures that surround their work” (Skinns, 2019).
Criminal justice actors have some degree of choice or leeway, within the parameters of the rules, to decide about which cases move to the next stage of the criminal justice process.


Skinns, L. (2019) Police powers and citizens’ rights: discretionary decision making inside police detention. London: Routledge.
MOJ (2017) Criminal Justice Statistics Quarterly update to December 2016, England and Wales. Available online
© The University of Sheffield
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