Transcript CSI: Criminal Science Investigation

CSI:
Criminal Science Investigation
Schools’ Edition
Breaking News,
Professor Murdered!
Newspaper article about the Professor’s murder
Dear Detectives
You may have seen from The Daily Gossip newspaper that leading Biochemist Professor Johnson
has been found dead in his laboratory this morning. Well we think he’s been murdered.
Shirlie Holmes is not on holiday as the newspaper says, she’s just pretending as she thinks that
this case is too hard to solve, so we’re hiring you to help us as a Special Detective.
You will need to use all your science and crime-fighting skills on each piece of evidence in the
case files to help connect a suspect to the crime.
We need you to help solve this murder case and catch the suspects before they strike again.
The Chief of Police
Professor Johnson
 First things first, lets start with Professor Johnson
 Here is a video of him experimenting in his lab before
the murder
Click Here
A Picture Tells a Thousand Words
 We found this photo, taken on the day of Professor
Johnson’s death. See anything peculiar?
 You may want to taker a closer look at the photo with
your magnifying glass. If you look close enough you
can see marks on the photo.
 We believe that Professor Johnson knew that he was
going to be murdered and left a series of clues in his
lab in order for us to find his murderer.
 Use the guidebook to help unravel the code!
Who did it?
 We pulled in everyone who had the last name ______
for interrogation.
 Watch the videos and fill in the Official Interrogation
Forms
 Interrogation Forms
 Discussion – who do you think did it?
Who did it?
 We’ll start with basics:
“Who are you?”
Murder Suspect 1
Murder Suspect 2
Murder Suspect 3
Murder Suspect 4
Who did it?
 Let’s see if any of the murder suspects knew Professor
Johnson.
“Did you know Professor Johnson?”
Murder Suspect 1
Murder Suspect 2
Murder Suspect 3
Murder Suspect 4
Who did it?
 The murderer may be lying about knowing Professor
Johnson. The Professor may have even been good
friends with the murderer before his death.
“Were you friends with Professor Johnson?”
Murder Suspect 1
Murder Suspect 2
Murder Suspect 3
Murder Suspect 4
Who did it?
 Let’s see what our suspects were doing on the day of
the murder – maybe the murderer will let something
slip.
 They may be lying, so listen carefully for any potential
clues.
“What were you doing on the day of the
murder?”
Murder Suspect 1
Murder Suspect 2
Murder Suspect 3
Murder Suspect 4
Who Did It?
 From the interrogation, who do you think murdered
the Professor?
 Did any of the suspects say anything that might make
you think that they murdered the professor?
Saliva Time
 Investigators took a sample of the professor’s saliva
and tested it with Universal Indicator Paper.
 What happens when you test your saliva?
 We tested the professors and it turned RED!
 This doesn’t look normal – maybe he was poisoned?
Professor Johnson spent all of that day
working in the laboratory...
...so that means that the murderer must
have gone into the lab to poison him!
Sodium Powder
 His lab was covered in a chemical powder called
sodium when we found him.
 But what exactly does sodium do?
 And what about when it is put into a Bunsen burner?
Flame Test
Click me
Sodium Powder
 There are other elements that are similar to sodium
but even more reactive.
Click to view the explosive power of rubidium and caesium
Sodium Powder
Investigators also found that 2 of the suspects had
sodium powder on their shoes too!
Maybe this will lead us to the killer?
Shoe Size?
 As well as the sodium we have found a footprint at the
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scene of the crime
Shoeprints can leave behind key information about the
wearer including the shoe type, where the person has been,
whether they have a limp and more simply the persons
shoe size.
Look at the casts of the shoes do any have a similar style
print as the one found at the crime scene?
What type of shoe was the suspect wearing?
To be sure of our suspects we also need to work out the area
of the shoe print to determine which suspect has the same
size.
Shoe prints?
 Although we found sodium on two of the suspect shoes
unfortunately we have mixed up all of the tags and so don’t
know which foot print matches with each suspect.
 We took photocopies of each suspect’s shoe and put their
name on each photocopy.
 Look at the casts: do any of the shoe markings match any of
the photocopies?
 Match each photocopy with the shoe cast number, so we
know which shoe belongs to who.
Only 2 suspects – but who did it?
 We’ve narrowed it down to these 2 murder suspects.
 They both have the same size feet and had sodium on
their shoes, which must mean that they were in the
Professor’s lab.
 What reasons could they have had for visiting the
Professor?
 We need to find out who did it and fast.
Fingerprint on the Test tube!
 We’ve had a break through! One of the policemen
found a small test tube which doesn’t belong to the
Professor.
 This must have contained the poison, and there’s a
fingerprint on it.
 We need to match up these fingerprints with the
murderer!
Fingerprint Matching
 Here is the fingerprint we found from the test tube
containing poison.
 We also have the fingerprints of the two remaining
suspects here.
 Which ones match the fingerprints on the test tube?
 Use the magnifying glass to help make your choice.
 Why not have a look at your own fingerprints and make
your own CSI Fingerprint Card using the Police Ink Pad?
 Fingerprint Guide
What does the suspect have to say?
Well Done!
 You have managed to solve a difficult case at which
even Shirlie Holmes turned her nose up!
 I, Chief Inspector of Police, send my thanks to you all.
 To commemorate your achievements I have
commissioned these special certificates for you all.
 Finishing Certificate
CSI:
Criminal Science Investigation
Schools’ Edition
© Steven Forrest 2010