Garrett Gross, a former MMA fighter, runs what some call a video vigilante group called Operation 17:2 that confronts alleged child sexual predators. Despite his group's intentions, however, JSO warns that they can create real obstacles for investigators.

A judge has dismissed conspiracy and kidnapping charges against five Massachusetts college students who were accused of plotting to lure a man to their campus through a dating app and then seizing him as part of a “Catch a Predator” trend on social media.