What do the Line Of Duty acronyms mean?

Dusty Baxter-Wright
·2-min read
Photo credit: BBC
Photo credit: BBC

From Cosmopolitan

Line Of Duty season six returned to screens last night, and judging by the reaction on Twitter, expectations were met. There were question marks over bent coppers, catchphrases from Ted Hastings and more suspicious looks than you could shake a police radio at. There were also a lot of acronyms.

If much of the dialogue in Line Of Duty leaves you thinking 'WTF?', consider this your official guide to Line Of Duty lingo, or an AC-12 dictionary.

What are the Line Of Duty acronyms?


Ted Hastings and Steve Arnott (and formerly Kate Flemming) work for AC-12, otherwise known as the Anti Corruption Unit 12.


Used frequently in the first episode of season six, many fans were left wondering what on earth CHIS means. It stands for 'Covert Human Intelligence Sources' and was used in relation to an informant, who was found dead.


One of the reoccurring acronyms used in Line Of Duty is OCG - referring to Organised Crime Groups / Organised Crime Gangs.

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The Murder Investigation Team, which Kate is now a part of.


The Police National Computer has been referred to a lot already in season six.


Otherwise known as Tactical Advisor.

Other police acronyms used in Line Of Duty

  • AFO – Authorised Firearms Officer

  • ARU – armed response unit

  • CID – Criminal Investigation Department

  • CPS – Crown Prosecution Service

  • CSE – Crime Scene Examiner

  • DIR – digital interview recorder

  • DPS – Directorate of Professional Standards

  • DVU – Domestic Violence Unit

  • GBH – Grievous Bodily Harm

  • FI – Forensic Investigator

  • IRV – incident response vehicle

  • Reg 15 – Regulation 15, when an officer has a complaint made against them

  • RTA – Road Traffic Accident

  • RTC – Road Traffic Collision

  • SIO – Senior Investigating Officer

  • TFC – Tactical Firearms Commander

  • TC – Traffic Collision

  • TOA – Time of Arrival

  • UCO – Under Cover Officer

  • VSS – Victim Support Scheme

Photo credit: BBC
Photo credit: BBC

Police ranks, from most senior DC – Detective Constable

  • DS – Detective Sergeant

  • DI – Detective Inspector

  • DCI – Detective Chief Inspector

  • DCS – Detective Chief Superintendent

  • ACC – Assistant Chief Constable

  • DCC – Detective Chief Constable

  • CC – Chief Constable

  • CSE – Crime Scene Examiner

  • FI – Forensic Investigator

  • FLO – Family Liaison Officer

  • FME – Forensic Medical Examiner

  • PCSO – Police Community Support Officer

  • SIO – Senior Investigating Officer

  • UCO – Undercover Officer

Consider yourself clued up on Line Of Duty lingo.

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