Haven't you always wanted to understand all the fancy Line of Duty lingo and know your TFCs from your REGs and your CHISs from your MOPIs?
With the return of the new series 6, here's a complete list of all the bits you need to grasp if you're a diehard fan.
Here’s what you might hear being muttered by Fleming, Arnott and Hastings this season and what the team are actually on about.
The BBC shared the document on social media and wrote: "A handy guide to those pesky acronyms in #LineOfDuty for you, fellas." (and, of course, females).
- CHIS – Covert Human Intelligence Source (an undercover agent who is recruited by the police but isn’t a police officer)
- DC – Detective Constable
- MIT– Major Investigation Teams (specialised homicide squads of the Metropolitan Police)
- DIR – Digital Interview Recording
- AC-12 – Anti-Corruption Unit 12
- MOPI – Management of Police Information
- OCG – Organised Crime Group
- UCO – Undercover Operative
- AFO – Authorised Firearms Officer
- ARV – Armed Response Vehicle
- TFC – Tactical Firearms Officer
- REG-15 – A notice telling an officer that a complaint has been made against them
- SFC – Strategic Firearms Commander
- FI – Forensic Investigator
- IOPC – Independent Officer for Police Conduct
- PACE – Police and Criminal Evidence Act
- RIPA – Regulation of Investigatory Powers Act 2000