Curveball (informant)

Okay kiddo, so a curveball is when someone tries to trick other people by saying things that are not true. But sometimes, there are people who help the police by pretending to be bad guys and telling on other bad guys. We call these helpers "informants". So a curveball informant is someone who helps the police by pretending to be a bad guy in order to catch other bad guys. It's like playing a game of pretend, but with a serious purpose!