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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

DCI Fleming, DS Steve Arnott and Superintendent Ted Hastings are back for season six of Line of Duty
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DCI Fleming, DS Steve Arnott and Superintendent Ted Hastings are back for season six of Line of DutyCredit: BBC

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.

What do these acronyms stand for?

Clue: Vicky McClure's character DCI Fleming is involved in this
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Clue: Vicky McClure's character DCI Fleming is involved in this
Clue: This has something to do with a CHIS
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Clue: This has something to do with a CHIS
Clue: You don't want to get on the wrong end of this
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Clue: You don't want to get on the wrong end of this
Clue: They are always watching you
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Clue: They are always watching you
Clue: Don't take it to heart
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Clue: Don't take it to heart
Clue: They will find out what you want to know
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Clue: They will find out what you want to know
Clue: Keep this hidden from others
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Clue: Keep this hidden from others
Clue: Always popular with AC-12
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Clue: Always popular with AC-12
Clue: This might make you think of Adrian Dunbar's character
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Clue: This might make you think of Adrian Dunbar's character
Clue: Kelly MacDonald's character is all over this
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Clue: Kelly MacDonald's character is all over this

How did you get on?

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Line of Duty fans go wild for fan theory that 'CHIS' is a secret code that is bad news for Steve Arnott
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