What is the first thing you look for at the scene of a murder? JJ, our guest today, is here to tell us, along with everything else you've ever wanted to know about investigating a crime scene. We haven't actually worked out if JJ is a secret serial killer, as he seems like the perfect person to commit a crime, because he knows exactly what to look for at a murder scene. But he's nice, so we trust him. A polite warning that this episode does contain descriptions of scenes that some listeners might find distressing.

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