Chris Hansen is an anchor for a popular news magazine show called Dateline NBC. They stopped doing the 60 Minutes format and now just run hour long documentaries about white people who got murdered for money or by their cheating ass spouses.
But back when they were an hour long show with several segments, one of the most popular was called To Catch a Predator. The staff would work with various groups who would troll chat rooms and online hang outs for men looking to make meetups with underage kids. They would hire a decoy, an adult who looked like a minor, and lure them into a house where cameras would be waiting to confront these perverts.
A local version of this is how they caught what's his face from RF video, coincidentally.