Skip to 0 minutes and 3 secondsSo Tracy is the person that has overall governance over the investigation. She decides the strategy. [KNOCK AT DOOR] Ah, here she is. Hi there. Hi, Tracy. How are you? Thanks for coming to my office at such short notice. No problem. Tracy, this is Natsumi. Hi. Nice to meet you, Tracy. Hello. You're the Senior Investigating Officer. That's right. Senior Investigating Officer. So we've got house-to-house inquiries, CCTV. OK. But most exciting for today is the forensics round that Gihan is leading on. What have you got for me? We've got some great results so far. We've had initial results from both our labs so far. They've managed to find the deceased's blood on one end of the weapon. Wow.

Skip to 0 minutes and 41 secondsWe haven't found any other sources of DNA on any other part of the metal bar so far. OK. So we've got no touch DNA from anybody else. It's just the victim's blood. I asked for a full trace evidence recovery on that metal bar, including touch DNA, extraneous hairs, and fibres. I think because of the conditions that the bar was recovered in, perhaps we haven't been able to be successful as we wanted to. But I think it's really positive that we've been able to link that metal bar to the deceased. Sure. Now, there was also a trail of blood spots leading away from the beach on the Thames path that our scenes of crime officers have swabbed. Yes.

Skip to 1 minute and 19 secondsThat has come back as a positive match to our suspect's reference sample, our suspect's reference DNA sample. Fantastic. So we're now able to place the suspect at the scene as well. Even though there weren't on the metal bar, I think it's still a really positive indication. That's great news. Now, we've managed to do a search of the suspect's property, which we call a Section 18 search, and we managed to recover some tablets there have been analysed by our other lab, our biochemistry lab. They've been confirmed as MDMA tablets, which have come from the same batch of MDMA tablets that we recovered from the scene.

Skip to 1 minute and 55 secondsThe packaging that was also found at the suspect's address has been positively linked to the packaging that we found at the crime scene also. So some fantastic overall results. That sounds really positive. So those are all the results that we've got back so far? They're the initial results that we've got at this moment in time, yes. But more than enough to be working on.

Skip to 2 minutes and 15 secondsSo I think the next stage is to get some witness statements to back up those great result reports, and I think what would be really helpful for you is if you could find out some more about the criminal justice process in the UK, how the courts actually function, and we'll put you in touch with somebody from the Crown Prosecution Service. They're our conduit to the investigation. They really set the standard for what we need in order to get this case to court. So we'll do that as soon as we can. Thank you. But really tough conditions on the beach there, so great results. Really good job. Thank you. Thanks.

Welcome to Week 4 – bringing the case to court


This final week is where all the threads of this exciting forensic investigation are drawn together, and you will be asked to make your own decisions. We’ve looked at the evidence from many angles, but it means nothing if it can’t be used to bring the case to a successful conclusion.

So this week you will learn about the many specialists and professionals who come together at a criminal trial to hear what the forensics experts, police and others believe is the truth. At the end of this week, you will have gained an understanding of how forensic evidence is presented, why record-keeping and the integrity of the chain of evidence is so important, and how legal teams plan their cases.

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The Science Behind Forensic Science

King's College London

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