Line of Duty quiz: How well do you know your CHIS from your MIT? Test your knowledge of police acronyms
IF last week’s Line of Duty had you scratching your head, it’s time to swot up on the acronyms before tonight’s episode.
From "CHIS" to "MIT", the season six opener had fans of the cop series googling some of the more specialist terms.
As DCI Kate Fleming and pals hunted down the murderer of journalist Gail Vella, the terms got ever more confusing.
One viewer said: "#LineOfDuty new drinking game. Drink every time someone on Line of Duty says chis."
Another joked: “For someone who’s never watched Line Of Duty before these acronyms are DMFHI.”
As the credits rolled, the BBC were forced to clarify what “CHIS” stood for.
So could you hack it on AC-12? Guess the meanings of these tricky acronyms to find out.
We've given you some clues to help - but no peeking at the answers below.