Search - National Standard Microsite

The Criminal Procedure and Investigations Code of Practice applies in respect of criminal investigations conducted by police. A criminal investigation can be defined an investigation conducted by police officers with a view to it being ascertained whether a person should be charged with an offence, or whether a person charged with an offence is guilty of it. 

This document sets out the manner in which police officers are to record, retain and reveal to the prosecutor material obtained in a criminal investigation.

The roles and responsibilities within a criminal investigation can vary. The functions of the investigator, the officer in charge of an investigation and the disclosure officer are separate. The amount of persons attached to this case to fulfil the above roles will depend on the complexity of the case and the administrative arrangements within each police force. Commonly, where there are more than one person undertaking the roles, close consultation between them is essential to the effective performance of the duties imposed by this code. 


Persons other than police officers who are charged with the duty of conducting an investigation as defined in the Act are to have regard to the relevant provisions of the code, and should take these into account in applying their own operating procedures. 


The purpose of this document is to provide guidance on the retention, storage and destruction of forensic materials and their associated records retained by physical and digital Forensic Units.

This manual has been produced by the NPCC Data Protection, Freedom of Information, information Sharing and Disclosure Portfolio Group on behalf of the NPCC. It is updated and adapted to reflect decisions made by the NPCC, views of the Information Commissioner’s Office (ICO) (where appropriate) and the evolution of the legislation as it is interpreted, challenged or reviewed.

Note that this manual has not yet been updated to reflect the legislative changes arising from The Data Protection, Privacy and Electronic Communications (Amendments etc)(EU Exit) Regulations 2019 as amended by The Data Protection, Privacy and Electronic Communications (Amendments etc)(EU Exit) Regulations 2020.

The manual should be regarded as a document that both helps to create an environment across the police service in which compliance can be achieved, and as a means of providing guidance in areas of police business where the Act is regularly applied.

The manual contains a wide variety of information including:

• Breakdown of governance and responsibilities
• Definitions
• General processing (GDPR & DPA Part 2)
• Comparison between General Processing and Law Enforcement obligations
• Law Enforcement processing (Part 3 of DPA)
• Intelligence Service processing (Part 4 of DPA)
• Assessing data protection compliance
• The Commisioner, enforcement & offences
• Case studies
• Wide variety of appendices including
  • Template DPIA
  • Template National data processing contract
  • Template information sharing agreement
  • Template Data Protection policy 

With the Police responding to critical and complex incidents, sometimes these incidents may require resources that go beyond the capacity and capability of the Police force. Some of these incidents may require the need of other partner agencies, other specialist skillsets and equipment and thus would need to be effectively managed and coordinated. Mobilisation is the process which supports mutual aid, at the local, regional or national level.

The National Police Coordination Centre (NPoCC) is responsible for the mobilisation of police assets, including general policing, operations and crime business areas. A lead force will be responsible for resourcing nationally-led crime enquiries. NPoCC should be the initial point of contact for any mobilisation requirements as it can provide advice and national coordination.

It is important to note that this a challenging area of work, particularly when the length of the investigation is unknown and mobilising crime assets is a new and emerging business field (mutual aid) for the Police service.

The National Intelligence Model (NIM) is a well-established model within the policing world that was established in 2000 by the National Criminal Intelligence service (NCIS) and adopted by Association of Chief Police Officers (ACPO) to help to mange the use of setting strategic direction, making prioritised resourcing decisions, intelligently allocating resources in the most efficient manner, developing and outlining tactical plans, coordinating activities and managing associated risks.

NIM has three levels which it operates on:

• Level 1 – Local/Basic Command Unit (BCU)

• Level 2 – Force and/or regional

• Level 3 – Serious and organised crime that is usually national or international

NIM doesn’t just only help to serve crime and intelligence decision-making but is expansive in its dynamics and touches on the general policing business and decision-making. It also serves as a standardised approach for gathering, co coordinating and disseminating intelligence, which can be integrated across all forces and law enforcement agencies.

NIM allows for greater consistency of policing across the UK, operational strategies to focus on key priorities, ensures more officers are focused on solving priority problems and targeting the most active offender, achieves greater compliance with human rights legislation, improves direction and briefing of patrols, helps to reduce rates of persistent offenders through targeting the most prolific and helps to improves integration with partner agencies.

European Pool against Organised Crime (EPOC IV) was introduced in 2004 as the Eurojust Case Management System.  It facilitates the secure storage of case-related personal data, the exchange of information amongst National Members and the analysis of that data.

EPOC also provides a set of tools to facilitate interoperability of national systems and can be used as a component to support international cooperation in national systems.   

Reference Dataset consists of:

• Currency Class

• EU EPOC Country (Bulgarian)

• EU EPOC Country (English)

• EU EPOC Country (French)

• EU EPOC Country (Lithuanian)

• EU EPOC Country (Slovene)

• EU EPOC Crime Type (Bulgarian)

• EU EPOC Crime Type (English)

• EU EPOC Crime Type (French)

• EU EPOC Crime Type (Lithuanian)

• EU EPOC Crime Type (Slovene)

• EU EPOC Currency Type (English)

• EU EPOC Currency Type (Lithuanian)

• EU EPOC Drug Code (English and Other Languages) L1 (English)

• EU EPOC Drug Code (English and Other Languages) L2 (Other Languages)

• EU EPOC Drug Code (Lithuanian)

• Home Office Drug Codes L2 (Description)

• ISO 3166-1 Country Codes 2 Char

Police have a duty to respond to every incident reported in an appropriate way and in a timely manner. A critical incident (CI) is defined as:

any incident where the effectiveness of the police response is likely to have a significant impact on the confidence of the victim, their family and/or the community. An incident can be escalated to a CI when the police fail to meet the expectation of a victim/family and/or the community in responding to an incident.

Therefore critical incident management (CIM) is key within the police force. Different types of incidents can become critical, high profile, serious or homicide related. If the police do not respond in a timely manner to serious incidents it can result in loss of confidence by the public.

There are 3 stages to CIM:

1. Preparing for critical incidents – considering current management structures to ensure staff are trained effectively and resources are available

2. Managing critical incidents – identifying critical incidents early on and notified to the most appropriate person.

3. Restoring public confidence – restoring broken confidence amongst the public by community engagement, resolution and public inquiry.

Decision-making in the Police service can be very complex. Police officers most often have to make decisions in very difficult circumstances and situations and may not have all the necessary or complete information to hand. It is also very important to note that the role that police officers play and the environment where they have to make decisions can be very complicated. Police officers and police staff are sometimes required to make decisions in circumstances where those involved deliberately mislead or try to mislead them. As a result it may not always lead to the best outcome.

Therefore to create a framework that could allow officers to base their decisions on, and allow for examination of each decision and allow for some form of standardisation in decision making the National Decision Model (NDM) was created.

At the heart of the NDM, the Code of Ethics highlighted is essential for all decision making. This gives confidence for police officers to use the NDM and reduces risk. Decision makers will be supported by their organisation where it can be shown that their decision was assessed by the NDM and the circumstances at the time, even when harm has resulted as part of the decision making process.

Civil emergencies require a professional and structured response to all emergencies, this includes Police, fire and ambulance services and must meet the Civil Contingencies Act 2004. These services must have interoperable arrangements to allow for well-coordinated responses to major or complex incidents, as this would affect life.

This document helps to cover contingency planning and responses to civil emergences from the Police service.

Some major incidents may result in loss of life. Disaster victim identification (DVI) is the process of being able to identify a deceased in multiple fatality incidents. This involves combining antemortem and post-mortem examinations to make a positive identification using scientific means. This takes place at the same time an investigation is being undertaken.  DVI is an internationally accepter terms is and its principles are subject to international agreement through INTERPOL.

The Command and Control (C&C) solution is the incident management and deployment solution for police officers responding to incidents reports by the public. Command and control is the authority and capability of an organisation to direct the actions of its personnel and the use of its equipment.

Incidents are usually graded based on severity of the incident and officers have Service Level Agreements (SLA’s) target in responding to incidents especially serious/critical incidents. SLA’s may differ from police force. C&C can also be used for a wide range of scenarios ranging from policing local community events, to responding to a major criminal investigation such as a terrorist attack, arson attack requiring several officers to respond to more sensitive investigations such as a rape incident requiring more specialised officers.

There are times where certain incidents or operations where the police response requires a different approach and it may be necessary to establish a dedicated command structure such as bronze, silver and gold.