Line of Duty returned to screens on Sunday for season 6.
And the first episode of the BBC one drama led to some complaints with some viewers left unhappy by one scene.
The scene involved character Ted Hastings, played by Adrian Dunbar, who oversees AC12.
The Northern Irishman made a controversial comment about Terry, a Down Syndrome character played by Tommy Jessop, who was arrested for the murder of journalist Gail Vella.
The character was referred to as an "oddball" by Superintendent Hastings.
The BBC has now responded following some complaints.
The BBC said: "Superintendent Ted Hastings' comments were not in reference to the character Terry Boyle's disability - Ted Hastings had never met Terry Boyle.
"Hastings was looking only at the evidence against Boyle, namely the press cuttings of Gail Vella found in his flat.
"The word 'oddball' means an eccentric person and has no meaning or connotation of disability and Hastings was referring to the stalker/obsessed fan theory of Gail Vella's murder."
Other cast members returning included Vicky McClure, the East Midlands actress from This is England who plays Kate Fleming.
The ongoing sixth series airs each Sunday evening at 9pm with episodes available on the BBC iPlayer after broadcast.
McClure, Dunbar and Compston are joined by newcomer Joanna Davidson, who is played by Trainspotting and Boardwalk Empire star Kelly McDonald.
