How far should an undercover police officer go to get evidence?
A group of eight women is suing the Metropolitan Police claiming they were tricked into long-term relationships with undercover officers.
It follows the revelation last year that one officer - Mark Kennedy - had spent seven years infiltrating environmental protest groups and had been involved with women he was targeting.
Now some of the women have spoken exclusively to File on 4 about their legal fight. Jane Deith reports.