CCTV has helped capture criminals all across the world, but, catching a killer on camera isn't as clear cut as you might think. In fact, what may seem like the smoking gun in a case, forensic photography is actually a complex and often misunderstood field. 

Glenn Porter is an expert in forensic photography, and has spent decades taking pictures of crime scenes, presenting evidence and explaining how the science of video and photography works in a forensic investigation. 

Join host Kathryn Fox as she unpacks a brutal double murder, and understands how CCTV footage lead to a conviction, but not as immediately as you might suspect. 

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