Line of Duty made a much welcomed, and highly-anticipated, return to TV screens last weekend.
With the new series set 18 months since we last saw them, a lot of things have changed at AC-12.
But our favourite characters - Superintendent Ted Hastings, Detective Sergeant Steve Arnott and Detective Inspector Kate Fleming - were all back, even if Kate has jumped over to the MIT.
What hasn't changed, however, is the frequent use of police acronyms - and there hasn't even been an intense interrogation scene yet.
Viewers were left baffled during episode one with the frequent use of CHIS.
The acronym, which stands for Covert Human Intelligence Sources, was used a lot during the debut episode as Detective Chief Inspector Joanne Davidson, played by Kelly Macdonald, arrived on the scene as the head of an unsolved, high-profile murder case.
Social media was flooded with comments and the BBC even addressed the confusion - as the credits rolled on the first of seven episodes - with a voice over saying: "CHIS, if you're wondering, is a covert human intelligence source."
So, to try keep you in the loop as much as possible for any upcoming scenes, here's an A-Z of some of the police acronyms that may arise in the rest of the series.
From OCG to UCO, you'll need to have all these at the ready if you really want to understand the action:
AC-12: Anti-corruption unit 12
ACC: Assistant chief constable
AFO: Authorised firearms officer
ANPR : Automatic Number Plate Recognition
ARVs: Armed Response Vehicles
CHIS: Covert Human Intelligence Source
COM: Covert operations manager
DI: Detective Inspector
DIR: Digital Interview Recording
FI: Forensic Investigator
I.P. Address: Internet Protocol address
IOPC: Independent Officer for Police Conduct
I.R: Incident Report
MIT: Murder Investigation Team
MOPI: Management of police information
OCG : Organised Crime Group
PACE : Police and Criminal Evidence Act
PNC: Police National Computer
REG 15 : Regulation 15 notice of misconduct/gross misconduct
RIPA : Regulation of Investigatory Powers Act 2000
RTC: Road Traffic Collision
SFC: Strategic Firearms Commander
SCG: Serious Crime Group
Sitrep - Situation Report
TA: Tactical Advisor
UCO: Undercover Operative
VO: Visiting Order
VPN: Virtual Private Network
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