Line of Duty might be completely fictional but many of the gripping storylines have actually been inspired by reality. AC-12 doesn't actually exist but is based on similar anti-corruption branches operating across the country, while show creator Jed Mercurio has explained how he got some of his ideas.
The Met Police's own version of AC-12, which was first known as A10 in the 70s, is now called the Directorate of Professional Standards (DOS).
Because so little was known about the unit it was previously known as the 'ghost squad' before being renamed A10, then changing to CIB1, and later CIB2.
The shooting of an innocent man in real life inspired Mercurio to write the first series of Line of Duty - with the opening episode starting with a
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