Forensics

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0:00:02 > 0:00:04Today on Cop School, a Cop School criminal has burgled this flat.

0:00:04 > 0:00:09Will the cadets be able to track him down with the help of forensics?

0:00:09 > 0:00:13This is going to test crime scene examination skills to the limit.

0:00:13 > 0:00:16I'm Rav Wilding, this is Cop School.

0:00:19 > 0:00:22Six wannabe coppers...

0:00:22 > 0:00:24meet the world's oldest police force.

0:00:24 > 0:00:30Their mission - to complete a unique training course.

0:00:30 > 0:00:34But are these cadets tough enough to cut it in the Met?

0:00:38 > 0:00:42Last time at Cop School, the cadets trained as traffic cops...

0:00:45 > 0:00:49..and had to investigate a major collision to find who was at fault.

0:00:49 > 0:00:52If we need further questions, we will ask for them.

0:00:53 > 0:00:56It's 8am sharp, and even though the cadets are tired,

0:00:56 > 0:00:59they have to be ready to spring into action at any moment.

0:00:59 > 0:01:02In this show, the Cop School cadets will be immersed

0:01:02 > 0:01:06in the world of crime scene examination and forensics.

0:01:06 > 0:01:09They've been told they're on their way to meet their mentor.

0:01:09 > 0:01:11Which is true.

0:01:11 > 0:01:15Exactly how they meet their mentor might be a bit of a surprise.

0:01:15 > 0:01:19'That's because he's here - slap bang in the middle of a crime scene.

0:01:19 > 0:01:20'Far from being a dead body,

0:01:20 > 0:01:25'he's alive, alert and ready to put the cadets through their paces.'

0:01:27 > 0:01:29CAR ALARM RINGS

0:01:34 > 0:01:36Hello. Can you hear me?

0:01:41 > 0:01:45You have just broken the first rule of crime scene examination.

0:01:45 > 0:01:47You never, ever contaminate a crime scene.

0:01:47 > 0:01:51I'm Greig Trout, a Metropolitan Police Service crime scene examiner.

0:01:51 > 0:01:53Whilst you're training here, I am your mentor.

0:01:53 > 0:01:57Forensics is the science behind crime solving.

0:01:57 > 0:02:00Using the latest technology and examination techniques,

0:02:00 > 0:02:04the police can work out exactly what took place in a crime scene

0:02:04 > 0:02:08by studying the evidence that the criminal left behind.

0:02:08 > 0:02:12Greig Trout's been working in forensics in the Met for six years

0:02:12 > 0:02:16and has worked with the police to solve hundreds of crimes.

0:02:17 > 0:02:21But can the Cop School cadets learn enough about CSE for them

0:02:21 > 0:02:23to succeed in the final challenge?

0:02:23 > 0:02:27Every single piece of evidence left behind in a crime scene

0:02:27 > 0:02:30is crucial to the investigation.

0:02:30 > 0:02:35From something the size of a human body to the tiniest hair and fibre.

0:02:35 > 0:02:39And even DNA, invisible to the naked eye.

0:02:39 > 0:02:41In order to avoid contaminating a crime scene,

0:02:41 > 0:02:45the cadets will have to wear personal protective equipment (PPE).

0:02:46 > 0:02:48OK, cadets.

0:02:48 > 0:02:51The work of a crime scene examiner can be precise and painstaking.

0:02:51 > 0:02:55You must avoid disturbing and contaminating the crime scene.

0:02:55 > 0:02:59For this test, we want you to get from one end to the other,

0:02:59 > 0:03:03- using these special stepping plates. - But, as this is Cop School,

0:03:03 > 0:03:05there's going to be added pressure.

0:03:05 > 0:03:09You're also going to carry your forensic case with you in one hand.

0:03:09 > 0:03:15You're going to work in pairs. The first pair will be Megan and Sam.

0:03:15 > 0:03:17Great!

0:03:17 > 0:03:21As CSEs have to be efficient and quick at crime scenes,

0:03:21 > 0:03:24Greig will be timing the cadets to see who gets across the fastest.

0:03:24 > 0:03:26Three, two, one.

0:03:26 > 0:03:28HE BLOWS WHISTLE

0:03:28 > 0:03:30'Speed isn't the only factor.'

0:03:30 > 0:03:31Give me the briefcase.

0:03:31 > 0:03:34'If, at any time, the cadets contaminate the crime scene

0:03:34 > 0:03:39'with either their suitcases or themselves, they will be penalised.

0:03:39 > 0:03:42'They must be quick, efficient and, above all, careful.

0:03:42 > 0:03:46'In a real crime scene, CSEs might use these stepping plates

0:03:46 > 0:03:50'to minimise the disturbance caused to the crime scene floor.'

0:03:50 > 0:03:52Don't let that case touch the floor.

0:03:52 > 0:03:58- Did you get it?- 'Megan's lost balance and contaminated the crime scene.

0:03:58 > 0:04:02'That's unlucky.' Well done, Megan! You're nearly there now.

0:04:02 > 0:04:05Remember, all of those plates have to cross the line.

0:04:05 > 0:04:10- Last plate.- Good effort. Well done! Well done!

0:04:10 > 0:04:14We slowly put it on the ground and we both slowly stepped...

0:04:14 > 0:04:18- OK, Nathan, Jade. Three, two, one. - HE BLOWS WHISTLE

0:04:18 > 0:04:22Beat the time of the team in front of you.

0:04:22 > 0:04:23'Having watched Megan and Sam,

0:04:23 > 0:04:27'Jade and Nathan are craftily trying out a different technique.

0:04:27 > 0:04:29'Although it may help them cross quickly,

0:04:29 > 0:04:32'they are actually disturbing the crime scene twice as much.

0:04:32 > 0:04:37'By creating two lines of stepping plates, side by side,

0:04:37 > 0:04:40'Nathan and Jade are creating a wider field of disturbance.

0:04:40 > 0:04:42'And possible contamination of evidence.

0:04:42 > 0:04:47'Many different specialists are involved in examining the scene.

0:04:47 > 0:04:52'That's why it's important there's only one route through it.'

0:04:52 > 0:04:54Nearly there! You can see the tape.

0:04:54 > 0:04:59'And they're across.' Nice finish! Not bad.

0:04:59 > 0:05:02'Last up, it's Junior and Rebecca.'

0:05:02 > 0:05:06You're not going in that crime scene till you're correctly dressed.

0:05:06 > 0:05:10'And they've already contaminated the crime scene.

0:05:10 > 0:05:14'It's essential their protective clothing is worn properly.'

0:05:14 > 0:05:17Not a good start! 'That mistake could cost them.'

0:05:17 > 0:05:20OK, come on. Catch-up that time you just lost putting your hoods up.

0:05:20 > 0:05:24'Wearing the PPEs may be uncomfortable for the cadets,

0:05:24 > 0:05:26'especially in such a physical challenge.'

0:05:26 > 0:05:28- Keep your balance!- Go, Junior!

0:05:28 > 0:05:34'But part of being a CSE is to leave no trace of yourself behind.

0:05:34 > 0:05:37'Not a hair from your head or a fibre from your clothes.'

0:05:37 > 0:05:39You're doing really well.

0:05:39 > 0:05:43'Be careful there, Junior! Don't lose your balance.

0:05:43 > 0:05:46'And it looks like Junior's shoe cover has come off.

0:05:46 > 0:05:49'So close to the end. That's a schoolboy error.'

0:05:49 > 0:05:51You're almost there. Last one.

0:05:53 > 0:05:56I'm annoyed because my shoe came off.

0:05:56 > 0:06:00- The pedals were so small, I couldn't keep both my feet in.- It's OK.

0:06:00 > 0:06:02We did OK. We did good.

0:06:02 > 0:06:03Really irritated me.

0:06:05 > 0:06:08OK, guys, who's ready for some results?

0:06:08 > 0:06:13- Yeah.- So, Megan and Sam, 3 minutes 10 seconds.

0:06:15 > 0:06:20Rebecca and Junior with 2 minutes 16.29 seconds.

0:06:20 > 0:06:24'That 0.29 could be important.'

0:06:24 > 0:06:29Nathan and Jade, 2 minutes 16.19 seconds.

0:06:29 > 0:06:31- Yes!- Well done!

0:06:31 > 0:06:34THEY SING

0:06:34 > 0:06:37Very, very, very sad.

0:06:38 > 0:06:39Ta-da!

0:06:42 > 0:06:45With the physical activities out of the way,

0:06:45 > 0:06:47it's time to engage their minds.

0:06:47 > 0:06:50Forensics is a test of brain power.

0:06:50 > 0:06:52A CSE will have to recreate in their minds

0:06:52 > 0:06:54the events that happened during the crime.

0:06:54 > 0:06:58Greig has set up this fake crime scene

0:06:58 > 0:07:01to introduce the cadets to the basics of CSE.

0:07:01 > 0:07:04As a crime scene examiner, we attend crime scenes

0:07:04 > 0:07:07from anything from a murder to a burglary.

0:07:07 > 0:07:09We'll retrieve any evidence that might be there.

0:07:09 > 0:07:11That evidence is labelled and bagged.

0:07:11 > 0:07:13That exhibit can then be presented at court.

0:07:13 > 0:07:18There are three main steps to take when entering a crime scene -

0:07:18 > 0:07:20secure, spot and save.

0:07:20 > 0:07:23We only want people that are involved in a crime scene going in and out.

0:07:23 > 0:07:26The first thing we've got to do is secure the crime scene.

0:07:26 > 0:07:27Remember we learned about contamination?

0:07:27 > 0:07:30That's exactly what we're trying to do with this.

0:07:30 > 0:07:32Private investigation!

0:07:32 > 0:07:35Then we'll conduct a walk through. We'll walk through the scene

0:07:35 > 0:07:38and try and figure out what the suspect's movements have been.

0:07:38 > 0:07:41It looks like someone's tried to find something valuable.

0:07:41 > 0:07:43They've gone over there, come round here,

0:07:43 > 0:07:45knocked that down and gone there.

0:07:45 > 0:07:49Someone might be looking for files, like.

0:07:49 > 0:07:53Anything that a CSE deems to be important to the case

0:07:53 > 0:07:56must be numbered with cones.

0:07:56 > 0:07:59Photograph the scene. What they've touched, what they've disturbed.

0:07:59 > 0:08:03The key is to photograph the item in close-up and at a distance,

0:08:03 > 0:08:06to provide as much information for the jury as possible.

0:08:06 > 0:08:09Guys, well done. That's brilliant.

0:08:09 > 0:08:10Absolutely fantastic.

0:08:15 > 0:08:18Forensics teams are made up of many different types of experts,

0:08:18 > 0:08:21who all specialise in different areas

0:08:21 > 0:08:24of retrieving and gathering evidence.

0:08:24 > 0:08:27Having learned the basics in CSE, it's now time

0:08:27 > 0:08:30for our cadets to delve deeper into the world of forensics.

0:08:30 > 0:08:34They will now learn to retrieve the most crucial types of evidence -

0:08:34 > 0:08:36evidence that will lead the suspect

0:08:36 > 0:08:40to the scene of a crime and ultimately find them guilty.

0:08:41 > 0:08:43Greig has split the cadets into two teams.

0:08:43 > 0:08:48Team One will focus on the retrieval of tool and footwear marks.

0:08:48 > 0:08:53Team Two will learn how to retrieve fingerprints, hairs and fibres.

0:08:53 > 0:08:56Here we're going to make some casts of footwear marks.

0:08:56 > 0:08:59It's one of the best sources of evidence we can get.

0:08:59 > 0:09:02Like a fingerprint, a footwear mark has different pieces

0:09:02 > 0:09:06of wear and damage in the sole of it that makes it unique to that shoe.

0:09:06 > 0:09:09So we can match a suspect with a crime scene mark.

0:09:09 > 0:09:13Retrieving a footprint is a little like making a cake.

0:09:13 > 0:09:16It takes a specific number of ingredients

0:09:16 > 0:09:18and a specific order in which to mix them.

0:09:18 > 0:09:22First, a soft surface and a suspect's footprint.

0:09:22 > 0:09:24Give it a coating of sticky hairspray

0:09:24 > 0:09:26to help keep the shape intact.

0:09:26 > 0:09:32- Lovely.- Add a metal dan, then combine one bag of pink plaster of Paris

0:09:32 > 0:09:34with a small jug of water and mix thoroughly.

0:09:34 > 0:09:37It's really mushy.

0:09:37 > 0:09:39Don't let it set, Nathan.

0:09:39 > 0:09:41I want to make sure it doesn't come out.

0:09:41 > 0:09:44Next carefully - carefully...

0:09:44 > 0:09:48cut the bag and pour the mixture into the footprint.

0:09:48 > 0:09:50You never put it in properly.

0:09:50 > 0:09:52I'd worry about your own, Nathan.

0:09:52 > 0:09:56You know what happens to crown stone if you don't keep mixing it.

0:09:56 > 0:09:58It's not come out!

0:09:58 > 0:10:00- Yep.- I need more water.

0:10:00 > 0:10:03I think you need a bit more than that, Nathan.

0:10:03 > 0:10:06While our scientific chefs wait for their shoe moulds to set,

0:10:06 > 0:10:09let's catch up with Team B,

0:10:09 > 0:10:11who are currently at another fake crime scene,

0:10:11 > 0:10:14dusting for those all-important fingerprints.

0:10:14 > 0:10:15That's really clear, Junior.

0:10:15 > 0:10:17Your fingerprints are unique to you.

0:10:17 > 0:10:20There are no two sets of fingerprints the same,

0:10:20 > 0:10:24which means any found at a crime scene could incriminate a suspect.

0:10:24 > 0:10:27This is the most important tool in your case.

0:10:27 > 0:10:31It can light up anything. It reflects that finger mark right back at you.

0:10:31 > 0:10:34Torch aside, you still need a keen eye, Megan.

0:10:34 > 0:10:36I can't find any!

0:10:36 > 0:10:39Yes, you can. Keep looking!

0:10:39 > 0:10:42'Once spotted, a delicate brush with aluminium powder

0:10:42 > 0:10:46'will bring that sweaty fingerprint to life.'

0:10:46 > 0:10:49You might want a little bit less powder than that.

0:10:49 > 0:10:51'Oh, dear, Megan.'

0:10:51 > 0:10:55Next, a strip of sticky tape - minus that large air bubble, Junior -

0:10:55 > 0:10:59can be used to lift the coated fingerprint from the glass.

0:10:59 > 0:11:01Fantastic.

0:11:01 > 0:11:05It's then rollered onto a plastic sheet and documented.

0:11:05 > 0:11:09Back with Team A, and time for the big reveal.

0:11:09 > 0:11:12Very good. Nice.

0:11:12 > 0:11:15- Erm...- Shut up, Jade!

0:11:16 > 0:11:19Now all it takes is a quick brush down

0:11:19 > 0:11:21and the footwear mark is revealed.

0:11:21 > 0:11:23Very good, Sam. That's a good mark.

0:11:23 > 0:11:24Great cast, Jade.

0:11:24 > 0:11:29Good detail, Sam. And, Nathan, maybe you'll do better next time.

0:11:29 > 0:11:32OK, this method's called electrostatic lifting.

0:11:32 > 0:11:36We use it for dusty marks on hard surfaces.

0:11:36 > 0:11:39You can also use it on carpet. It brings up anything with dust on it.

0:11:39 > 0:11:42It attaches itself to a sheet of foil

0:11:42 > 0:11:45from which we can get a perfect footwear mark.

0:11:45 > 0:11:48First, the CSE needs a piece of mylar foil,

0:11:48 > 0:11:51cut to the size of a footprint.

0:11:51 > 0:11:53Thank you.

0:11:53 > 0:11:55Next, add an earthing plate to conduct the electricity, and a

0:11:55 > 0:12:01path finder, a special instrument that supplies electrical charge.

0:12:01 > 0:12:02Then switch it on.

0:12:02 > 0:12:07The electricity then sucks the foil to the surface and attracts the dust

0:12:07 > 0:12:09to it, producing the perfect print.

0:12:09 > 0:12:13But not all the retrieval methods in CSE involve

0:12:13 > 0:12:16strawberry milkshake-coloured gunge and electricity.

0:12:16 > 0:12:19For some, it's simply a pair of tweezers and sticky tape.

0:12:19 > 0:12:23Hairs and fibres can match a suspect's clothing

0:12:23 > 0:12:26with any hairs and fibres found on a surface.

0:12:26 > 0:12:29They may not look like much but under the microscope,

0:12:29 > 0:12:31hair and fibres offer a

0:12:31 > 0:12:36wealth of information, from the type of clothing worn to a person's DNA.

0:12:36 > 0:12:38That's it. Keep going.

0:12:38 > 0:12:40It's like spaghetti, isn't it?

0:12:40 > 0:12:43'Sorry, guys, it may not look exciting,

0:12:43 > 0:12:46'but it's a crucial part of being a CSE.

0:12:46 > 0:12:48'Any one of those hairs or fibres could match

0:12:48 > 0:12:51'with those taken from a suspect. So stay sharp, cadets.

0:12:51 > 0:12:55'You're the brains of this outfit.

0:12:55 > 0:12:57'For the final lesson of the day,

0:12:57 > 0:13:01'Team A are concocting one last forensic dish.

0:13:01 > 0:13:02'It's tool mark surprise.'

0:13:02 > 0:13:05If you've got a burglar who's broken in through a window

0:13:05 > 0:13:09- using a screwdriver or a crowbar... - 'Or a spade, Greig.'

0:13:09 > 0:13:13..that will leave tiny marks on the surface that we need to get hold of.

0:13:13 > 0:13:17'The cadets will need some putty, or silly putty in Nathan's case...

0:13:17 > 0:13:21Everyone else gets a ball. I get a sausage!

0:13:21 > 0:13:25'..some glue and some hardening gel.

0:13:25 > 0:13:28'First mould a piece of Plasticine into a small dome shape

0:13:28 > 0:13:30'and stick it beneath the tool mark.

0:13:30 > 0:13:32'This will help catch any unwanted spillage.'

0:13:32 > 0:13:35There you go, squeeze it on.

0:13:35 > 0:13:40'Next, the paste. Put 40ml of glue into a small pot.'

0:13:40 > 0:13:42- It looks like ice cream. - I can assure you it's not.

0:13:42 > 0:13:46- Eight drops of hardening gel... - Whoa.

0:13:46 > 0:13:48..and mix carefully. Be careful, though.

0:13:48 > 0:13:53Once the hardening gel is added, it's not long before it sets.

0:13:53 > 0:13:56Where have I seen this go wrong before, Nathan?

0:13:56 > 0:13:59Once thick, it's time to coat that tool mark.

0:13:59 > 0:14:02Take the gloop and cover that indentation.

0:14:02 > 0:14:05Apply more until the paste is set. Unless of course...

0:14:07 > 0:14:09What's happening, Nathan?

0:14:09 > 0:14:11'..it's already set.'

0:14:11 > 0:14:13- Oh, no!- 'Again.'

0:14:13 > 0:14:16- Did you put too much of that stuff in?- Yeah.

0:14:16 > 0:14:19If you did get it right, then once the paste is set,

0:14:19 > 0:14:22it's simply a matter of carefully peeling off the mould,

0:14:22 > 0:14:23checking the indentation,

0:14:23 > 0:14:27and popping it in an evidence box ready to be posted to the lab.

0:14:31 > 0:14:33'Congratulations, cadets.

0:14:33 > 0:14:37'That was a lot to take in. You've successfully completed forensics training.'

0:14:37 > 0:14:40Now it's time to select our leader.

0:14:40 > 0:14:44So today's leader is going to be Junior.

0:14:46 > 0:14:5013-year-old Junior from Birmingham loves playing all sports.

0:14:50 > 0:14:51Three, four...

0:14:51 > 0:14:54He's a talented drummer and definitely has the confidence.

0:14:54 > 0:14:56I don't think I'm going to struggle.

0:14:56 > 0:14:58I know what's coming and I'm ready for it.

0:14:58 > 0:15:02But is he ready to lead a team of Cop School cadets?

0:15:02 > 0:15:06While Junior loves being leader, over in a nearby neighbourhood

0:15:06 > 0:15:09a crime has just been reported to the police.

0:15:09 > 0:15:12I came back home as normal to find my door was open.

0:15:12 > 0:15:15I found a man rifling through my things.

0:15:15 > 0:15:16He ran out, dropped his sunglasses.

0:15:16 > 0:15:19I looked round to see what was missing.

0:15:19 > 0:15:21A necklace, laptop, wallet, watch, phone.

0:15:21 > 0:15:24He'd even taken lemonade out of the fridge.

0:15:24 > 0:15:26When he ran out, I never saw him again.

0:15:26 > 0:15:30"Cadets, there's been a burglary at a nearby flat.

0:15:30 > 0:15:33"Get to the scene of the crime as quickly as possible,

0:15:33 > 0:15:36"taking everything you need to assess the scene and examine the evidence."

0:15:36 > 0:15:38Got it. Thanks. Let's go.

0:15:38 > 0:15:41Before they leave, it's crucial Junior makes sure

0:15:41 > 0:15:44they have all the equipment they're going to need.

0:15:46 > 0:15:49- Have we got the crime stone? - It's all in there.

0:15:49 > 0:15:52It's all in there. All right, let's go.

0:15:52 > 0:15:53Good leadership, Junior.

0:15:53 > 0:15:57With the equipment check now done, it's off to the scene of the crime.

0:16:01 > 0:16:05Earlier, a Cop School criminal committed a burglary here in this flat.

0:16:05 > 0:16:08As he searched the rooms for things to steal,

0:16:08 > 0:16:10he left behind eight pieces of evidence

0:16:10 > 0:16:14which the cadets will have to find, photograph and retrieve.

0:16:16 > 0:16:17This is where they are.

0:16:17 > 0:16:20On the front door, both shoe and tool marks.

0:16:20 > 0:16:25In the hallway, a foot mark and some glasses.

0:16:25 > 0:16:28In the kitchen, an open bottle.

0:16:28 > 0:16:31In the lounge, fingerprints on the coffee table.

0:16:31 > 0:16:35And in the bedroom, fingerprints on the window ledge

0:16:35 > 0:16:37and fibres on the chair.

0:16:37 > 0:16:41But will they remember everything they've been taught by mentor Greg?

0:16:41 > 0:16:42Come on, guys.

0:16:42 > 0:16:45Team leader Junior has split them into teams of two,

0:16:45 > 0:16:48allocating different roles to each pair.

0:16:48 > 0:16:52Acting as senior forensic practitioners are Megan and Rebecca.

0:16:52 > 0:16:55They're responsible for spotting and marking evidence

0:16:55 > 0:16:57and, later, dusting for prints.

0:16:57 > 0:17:00Sam and Nathan are the assistant forensic practitioners

0:17:00 > 0:17:04and will be retrieving tool marks and shoe marks.

0:17:04 > 0:17:07Jade and Junior will be the photographers.

0:17:07 > 0:17:09Come on, let's go. Let's go to work, come on.

0:17:10 > 0:17:13Both myself and mentor Greg

0:17:13 > 0:17:16will be keeping a very close eye on the cadets.

0:17:16 > 0:17:19There's a camera in every room of the flat,

0:17:19 > 0:17:23so from here, we can see every element of the cadets' search.

0:17:23 > 0:17:26First into the crime scene are Megan and Rebecca.

0:17:26 > 0:17:30Hopefully they've learned to be careful when they go into the scene.

0:17:30 > 0:17:33Secure it. Figure out what evidence they're going to get.

0:17:34 > 0:17:37OK, it's safe to stand here.

0:17:37 > 0:17:40Watch where you're stepping, though.

0:17:40 > 0:17:41Good call, Megan.

0:17:41 > 0:17:45There's an important piece of evidence right beside your foot.

0:17:45 > 0:17:46Let me know everything...

0:17:46 > 0:17:48But they've walked straight past it.

0:17:48 > 0:17:52That footprint could be a clue as to how the criminal entered the flat.

0:17:54 > 0:17:58There's a broken, shattered glass beside the window.

0:17:58 > 0:18:03- How does it look? Is it outside or inside?- Is it the window glass?

0:18:03 > 0:18:07Junior is thinking the criminal may have broken into the flat through the window.

0:18:07 > 0:18:10Does it look like someone's come through there?

0:18:10 > 0:18:13No, the window's shut and the curtains are closed over,

0:18:13 > 0:18:17- so he couldn't have got through the window.- OK.

0:18:17 > 0:18:20It's a logical guess, but it's not right.

0:18:20 > 0:18:24The glass is from an empty vase knocked over by the Cop School criminal.

0:18:24 > 0:18:26Moving into the bedroom.

0:18:26 > 0:18:31The curtains are all crumpled up and the window is open.

0:18:31 > 0:18:33That's a good spot from Megan.

0:18:33 > 0:18:35The Cop School criminal was here

0:18:35 > 0:18:37and he did leave valuable evidence behind.

0:18:37 > 0:18:39This is the lounge.

0:18:39 > 0:18:45So... There's fingerprints on the glass table in the lounge.

0:18:45 > 0:18:47Fingerprints on the table.

0:18:47 > 0:18:49"Put a cone on it."

0:18:49 > 0:18:52- "Already done. Over."- Already done!

0:18:52 > 0:18:57You're doing a very good job. Carry on. Don't miss anything.

0:18:57 > 0:19:01- Thank you.- Morale-boosting the troops, that's what we like to see.

0:19:01 > 0:19:03Fantastic work, Junior.

0:19:03 > 0:19:06They said that the victim dropped something,

0:19:06 > 0:19:09so I'm wondering is there anything dropped?

0:19:09 > 0:19:12Good question, Junior. He's referring to the sunglasses

0:19:12 > 0:19:15the witness said the criminal dropped.

0:19:15 > 0:19:17Found a man rifling through my things.

0:19:17 > 0:19:20He ran out, dropped his sunglasses on the way.

0:19:21 > 0:19:24It looks like Rebecca has found them.

0:19:24 > 0:19:26"We have a pair of sunglasses."

0:19:26 > 0:19:28Put a cone on it.

0:19:28 > 0:19:33Those sunglasses could provide vital DNA if it can be retrieved later on.

0:19:33 > 0:19:37It's not a bad effort from our senior forensic practitioners.

0:19:39 > 0:19:42So, they've found three crucial bits of evidence.

0:19:42 > 0:19:43Fingerprints in the lounge,

0:19:43 > 0:19:45fingerprints in the bedroom,

0:19:45 > 0:19:47sunglasses in the hallway.

0:19:47 > 0:19:50But they're still missing five other pieces of evidence,

0:19:50 > 0:19:53including that footprint right in front of the door.

0:19:53 > 0:19:55Will the cadets spot it?

0:19:57 > 0:19:59Here come the photographers.

0:19:59 > 0:20:05Jade's straight in there, taking photographs of the sunglasses but...

0:20:05 > 0:20:08The footwear mark - doesn't look like it's been spotted.

0:20:08 > 0:20:12And unfortunately, Junior's just stood right on top of it.

0:20:12 > 0:20:14Not the greatest start.

0:20:14 > 0:20:17"Taking a picture of the table."

0:20:20 > 0:20:23Make sure you take a picture wide and take a picture zoomed.

0:20:23 > 0:20:27That's good to hear. Nathan's reminding the photographers

0:20:27 > 0:20:32of the importance of the long lens and the close-up pictures.

0:20:33 > 0:20:35Here, here.

0:20:35 > 0:20:37Looks like Jade's on to something.

0:20:37 > 0:20:40We found an open substance in a glass bottle

0:20:40 > 0:20:44and we found a few open wine bottles.

0:20:44 > 0:20:49Didn't the victim say that he never opened a bottle?

0:20:49 > 0:20:53Did he say that he never opened any drinks?

0:20:53 > 0:20:56Rebecca's saying take pictures of the bottles.

0:20:56 > 0:20:59Outstanding communication from the cadets -

0:20:59 > 0:21:00and they're absolutely right.

0:21:00 > 0:21:03It WAS the Cop School criminal

0:21:03 > 0:21:05and this bottle is a solid piece of evidence.

0:21:07 > 0:21:11It looks as though our forensic photographers might be on a roll.

0:21:11 > 0:21:15Yep. Look, can you see that glimpse of hair there?

0:21:17 > 0:21:18See?

0:21:21 > 0:21:22Yep?

0:21:22 > 0:21:26We found some hair in the bedroom on the seat.

0:21:26 > 0:21:28What room is that in?

0:21:28 > 0:21:31- The bedroom.- OK.

0:21:31 > 0:21:34The Cop School criminal did sit in this chair.

0:21:34 > 0:21:38That's one of the most difficult spots to find.

0:21:38 > 0:21:41Sam's going to go in. Is that OK?

0:21:41 > 0:21:42Yeah, no problem.

0:21:42 > 0:21:46On the way back, look for any footprints that we can see, OK?

0:21:46 > 0:21:47We'll take a picture.

0:21:47 > 0:21:49In the hallway now.

0:21:49 > 0:21:52See if they notice the footwear mark.

0:21:52 > 0:21:54Here we go. They're taking a picture.

0:21:54 > 0:21:56Excellent. Brilliant.

0:21:56 > 0:21:58Finally, that elusive footwear mark.

0:21:58 > 0:22:00Better late than never.

0:22:00 > 0:22:02They got it and they're taking photos.

0:22:02 > 0:22:04We want to see it lifted now.

0:22:06 > 0:22:10Well done, photographers. You've done a great job.

0:22:10 > 0:22:14So now with six pieces of evidence marked and photographed,

0:22:14 > 0:22:16it's the job of the retrieval team -

0:22:16 > 0:22:19made up of Sam, Nathan, Megan and Rebecca -

0:22:19 > 0:22:22to go into the crime scene and extract that evidence.

0:22:22 > 0:22:25However, they still need to be observant.

0:22:25 > 0:22:26Let's go to the living room.

0:22:26 > 0:22:30There are still two more pieces of evidence they haven't found.

0:22:32 > 0:22:34Megan and I are in the living room.

0:22:34 > 0:22:37Megan's taking fingerprints on the glass table.

0:22:37 > 0:22:39I'm going to check for hairs on the sofa.

0:22:39 > 0:22:42This will be a big test for Megan,

0:22:42 > 0:22:46as she didn't do all that well at fingerprint retrieval in training.

0:22:46 > 0:22:49Over with Sam and Nathan, their test is what they can remember

0:22:49 > 0:22:52from foot mark retrieval.

0:22:52 > 0:22:55They're going to do the electrostatic lift

0:22:55 > 0:22:59of the footwear mark that they've got on the hallway.

0:22:59 > 0:23:02They've got the foil down, the earthing plate

0:23:02 > 0:23:04and now the path finder.

0:23:04 > 0:23:06Nice and slow.

0:23:06 > 0:23:08Very impressed with them so far.

0:23:08 > 0:23:11It's a very technical procedure.

0:23:11 > 0:23:13Make sure you don't touch the metal.

0:23:14 > 0:23:16It's now...

0:23:16 > 0:23:21a question of whether it's lifted the mark or not. It's looking good.

0:23:21 > 0:23:24- Think that's worked?- Yeah, yeah.

0:23:24 > 0:23:26Great retrieval, guys.

0:23:26 > 0:23:30If the police find the suspect, this could help convict him.

0:23:30 > 0:23:34Back in the living room, it looks like Megan is about to do exactly the same.

0:23:34 > 0:23:37We've got three fingerprints.

0:23:37 > 0:23:42She's got it. That to me is very nice. That's so clear from here.

0:23:42 > 0:23:45Megan's retrieved those fingerprints perfectly.

0:23:45 > 0:23:47If there's a match on the database,

0:23:47 > 0:23:50the police will know exactly who to arrest.

0:23:50 > 0:23:52You're doing a very good job.

0:23:52 > 0:23:56Junior and his team of forensic practitioners have stepped it up a gear.

0:23:56 > 0:23:57What about the dirt?

0:23:57 > 0:24:00Sam has found the footwear mark on the door,

0:24:00 > 0:24:03which should lead him to the tool marks, too.

0:24:03 > 0:24:06What about this? This is a bit...

0:24:06 > 0:24:08He's had a go with the tool, hasn't he?

0:24:08 > 0:24:10It has. Congratulations, cadets.

0:24:10 > 0:24:14That's all eight pieces of evidence discovered.

0:24:16 > 0:24:17Yeah!

0:24:17 > 0:24:21Now the cadets must retrieve as much of the evidence as they can

0:24:21 > 0:24:23with what little time remains.

0:24:23 > 0:24:27I think I've got a fingerprint on the metal bit of the window.

0:24:27 > 0:24:31- That's brilliant work.- 'That's another essential find from Megan.'

0:24:31 > 0:24:34Got a fingerprint in the bedroom on the windowsill.

0:24:34 > 0:24:37If these fingerprints match the ones in the lounge,

0:24:37 > 0:24:40the evidence will be stacked up against the suspect.

0:24:40 > 0:24:42Nathan!

0:24:42 > 0:24:43I've done it.

0:24:43 > 0:24:46Just seeing how Sam... He looks a bit nervous

0:24:46 > 0:24:48but he's taking off his tool mark.

0:24:48 > 0:24:53- I think it's hard enough. It won't get harder.- The clock is ticking.

0:24:53 > 0:24:55Got some of it.

0:24:55 > 0:24:58He's got it and in one piece. He's done a good job.

0:24:58 > 0:25:02- Looks like it from here.- It looks like it set very nicely.

0:25:02 > 0:25:06Guys, quickly. We've only got one minute left.

0:25:06 > 0:25:11With time almost up, Megan packages up another great set of fingerprints.

0:25:11 > 0:25:14The cadets can be happy with their performance

0:25:14 > 0:25:17as they managed to spot all eight pieces of evidence

0:25:17 > 0:25:18and retrieve five.

0:25:18 > 0:25:22- Great, guys. Well done. - Well done, everyone.

0:25:22 > 0:25:25Despite failing to retrieve evidence from the bottle in the kitchen,

0:25:25 > 0:25:29the chair in the bedroom and the sunglasses in the hall,

0:25:29 > 0:25:31Megan's excellent fingerprint retrieval

0:25:31 > 0:25:34led to a positive match in the Cop School database,

0:25:34 > 0:25:38so it won't be long before this known criminal is back behind bars.

0:25:40 > 0:25:44OK, Greg. They all did well on that challenge, it's fair to say.

0:25:44 > 0:25:48But some stood out a little bit more. Let's start with Megan.

0:25:48 > 0:25:51She did really well. She found the fingermarks on the table,

0:25:51 > 0:25:53the fingermarks on the windowsill.

0:25:53 > 0:25:57She was really thorough in how she retrieved and examined them.

0:25:57 > 0:26:00- Junior?- He did really well.

0:26:00 > 0:26:02He asked questions of everyone.

0:26:02 > 0:26:04He delegated responsibility.

0:26:04 > 0:26:08He made sure everyone was all right, which was a great way

0:26:08 > 0:26:11of keeping his team's morale going and keeping them on track.

0:26:11 > 0:26:13Someone else who did a good job was Sam.

0:26:13 > 0:26:16He was fantastic. Really good.

0:26:16 > 0:26:20He retrieved the footwear mark using the electrostatic lifting technique.

0:26:20 > 0:26:23He also did the tool mark on the door perfectly.

0:26:23 > 0:26:25Fantastic stuff.

0:26:25 > 0:26:27OK, cadets.

0:26:27 > 0:26:32This has been a very tough decision, but Greg and I have made it.

0:26:32 > 0:26:37We've decided that today there are in fact going to be two top cops.

0:26:37 > 0:26:42Now, those top cops are going to have

0:26:42 > 0:26:49a smashing time destroying some of the CSE sugar glass.

0:26:50 > 0:26:52- However...- A punishment.

0:26:52 > 0:26:55There will be a punishment for the rest of you.

0:26:55 > 0:26:59That will be cleaning out the CSE van.

0:26:59 > 0:27:01- Which is a mess.- No way.

0:27:01 > 0:27:03You're kidding.

0:27:03 > 0:27:07So the two top cadets for today are...

0:27:14 > 0:27:17- Megan.- Ooh!

0:27:17 > 0:27:19And Sam. Well done.

0:27:19 > 0:27:21Well done.

0:27:21 > 0:27:23Well done.

0:27:24 > 0:27:26Next time at Cop School,

0:27:26 > 0:27:29the cadets deal with virtual crowds in public order.

0:27:31 > 0:27:33There's lots to shout about in training.

0:27:35 > 0:27:38And they control a Cop School riot that gets out of hand.

0:27:38 > 0:27:39Go!

0:27:40 > 0:27:44Remember, this is sugar glass so don't try this at home.

0:27:44 > 0:27:47Go on, Megan.

0:27:47 > 0:27:48Yeah!

0:27:48 > 0:27:51Go on, Sam. Go on!

0:27:51 > 0:27:53Yeah!

0:27:53 > 0:27:55Subtitles by Red Bee Media

0:27:55 > 0:27:58Email subtitling@bbc.co.uk