Criminals use the internet. Some use the internet to commit crimes; others to plan real-world crimes. Law enforcement has had to learn to investigate crime on the internet. It's tricky. They're used to tapping phones; phones don't change so much. The internet keeps changing; maybe you figure out how to bug a Skype conversation, but this gang is setting up crimes by talking in World of Warcraft or somesuch… Crime is changing, this book shows some ways investigators are adapting.