By day they're ordinary shop workers, bus drivers and carers, but in their free time they set up online profiles posing as children in order to snare internet predators.
Crime and courts
Good evening - here are the stories that caught the attention of our reporters today.
A man who has acquired more than 40 convictions during his life of crime has been sent to jail for more than six years for dealing heroin.
Police Scotland’s chief constable has said he can’t give “any guarantee” over whether local policing will be impacted by COP26 – but says he has done everything he can to ensure communities won’t suffer.
A quarrying and construction company has been fined £130,000 over health and safety failings uncovered in the wake of a worker's death.
A man got into a high-stakes standoff with armed police when he abducted his girlfriend and held a knife to her throat.