Nonetheless, the strength of the recording was strong enough to suggest something inappropriate had occurred and it was enough to throw out the investigation.
After getting seriously reprimanded, Steve managed to get back into the good graces of his colleagues.
Meanwhile, Lindsay met a tragic end after she uncovered Matthew “Dot” Cottan (Craig Parkinson) was linked to the corruption in the police force.
She tried to expose him but he managed to kill her and try to cover his tracks but was ultimately caught out.
Line of Duty season 2 continues on BBC One tonight at 9pm