system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How was Chris Hanson's show, To Catch A Predator, legal?

I'm in full support of exposing child predators and putting them behind bars. What they do is despicable. I am curious, however, how the premise for the show is legal. Seems sketchy, legally speaking, since the child in question isn't actually a child but a fake online profile controlled by an adult with the sole purpose of incriminating someone else.
gpt
What you're probably thinking of is entrapment. Entrapment is when the police convince someone to commit a crime that they wouldn't otherwise commit. The suspects have to be the ones to do thing like start a sexual conversation, suggest a meeting, etc. The person behind the child's profile just plays along.