Line of Duty – The Acronym

[Image credit: BBC Television.)

This week saw the new series of the BBC’s Line of Duty hit our screens, with another battle ahead for the police against serious organised crime.

For those new to this drama, the first episode may well have been very confusing. The episode was clouded in layers of acronyms that a person not well versed in serious crime and investigation would have little if any knowledge of.

Examples included:

ARU/v – Armed Response Unit/Vehicle

DIR – Digital Interview Recorder

HPC – Health Care Professional (person instructed by the police to assess a person’s fitness to be detained and interviewed)

IC9 – Identity Unknown

MIT – Murder Investigation Team (or Major Incident Team)

OCG – Organised Crime Group (the baddies)

SOCO – Scenes of Crime Officer

UCO – Undercover Officer

The main story concerned the death of an important witness who was said to have heard the main suspect confess to a murder. This character was referred to, for most of the first episode, as a CHIS.

CHIS is short for Covert Human Intelligence Source, generally someone close to criminality working with the police and providing them with information (sometimes also referred to as a ‘grass’).

The use of a CHIS when investigating serious and complex crime is quite common, and we as a firm are well versed in ensuring that the proper protections put in place to protect suspects are followed. In all cases we will ensure that the law has been followed.

The use of CHIS is regulated under the Regulation of Investigatory Powers Act 2000 and Codes of Practice issued under that Act.

We pay particular attention to the recruitment, management, record keeping and handling aspects of CHIS arrangements.

Many aspects of CHIS handling will change as a result of a new Act passed by Parliament in the last few weeks: the Covert Human Intelligence Sources (Criminal Conduct) Act 2021.

The new Act deals with offences committed by a CHIS (whether that person is a undercover police officer or member of the public). The government explained the need for new legislation in these terms:

“Covert Human Intelligence Sources (CHIS) are crucial in preventing and safeguarding victims from many serious crimes including terrorism, drugs and firearms offences and child sexual exploitation.

Participation in criminal conduct is an essential and inescapable feature of CHIS use, otherwise they will not be credible or gain the trust of those under investigation. This enables them to work their way into the heart of groups that would cause us harm, finding information and intelligence which other investigative measures may never detect.

The Bill provides an express power to authorise CHIS to participate in conduct which would otherwise constitute a criminal offence.

This is not a new capability; the Bill provides a clear legal basis for a longstanding tactic which is vital for national security and the prevention and detection of crime.

Any authorisation for criminal conduct must be necessary and proportionate and compatible with obligations under the European Convention on Human Rights.

The Bill requires the Investigatory Powers Commissioner to keep under review public authorities’ use of the power and to include information on criminal conduct authorisations in his annual report.

The number of public authorities able to authorise this conduct has been restricted from those who can authorise the use and conduct of CHIS generally. Only the intelligence agencies, NCA, police, HMRC, HM Forces and ten other public authorities will be able to authorise criminal conduct.”

We will be carefully monitoring the implications of this new Act to ensure that defendant’s are afforded the proper protection of the law.

How can we help?

We ensure we keep up to date with any changes in legislation and case law so that we are always best placed to advise you properly. If you would like to discuss any aspect of your case, please contact any member of our vastly experienced Criminal Defence team, for assistance with any criminal law related matter.

Mr John Stokes (,
Mr Anthony Pearce ( or
Mr Daniel Woodman (

Leave a Reply

Your email address will not be published. Required fields are marked *

Contact Us

Give us a call or fill in the form below and we will contact you. We endeavor to respond to all enquires within 24 hours on business days.




    Click below to chat on WhatsApp

    × How can we help you?