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Forensic Science Introduction to forensics

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Forensic Science

Introduction to forensics

Learning outcomes

• Be able to describe a range of forensic methods

• Describe how SOCO’s avoid contaminating a crime scene

What do they do?• Property crime – burglary, fraud, robbery, fire,

vehicle crime• Serious crime – murder, suspicious death,

sexual offense• Drug related crime• Road crime – drink driving• Organised crime – terrorism• Hi-tech crime – computer or electronic• Investigate and detect crime – catch crooks and

free the innocent

Page 4: Forensic Science Introduction to forensics. Learning outcomes Be able to describe a range of forensic methods Describe how SOCO’s avoid contaminating

There’s been a murder!

Page 5: Forensic Science Introduction to forensics. Learning outcomes Be able to describe a range of forensic methods Describe how SOCO’s avoid contaminating

What does a SOCO do?

• SOCO – Scene Of Crime Officer– Employed by police

• First to arrive

• Observe crime scene

• Records facts and materials

• Must collect samples properly to ensure courts accept the evidence

Page 6: Forensic Science Introduction to forensics. Learning outcomes Be able to describe a range of forensic methods Describe how SOCO’s avoid contaminating

How did they…

• Restrict access to scene?

• Stop contamination of evidence?

• Carry out reliable sampling of evidence?

Page 7: Forensic Science Introduction to forensics. Learning outcomes Be able to describe a range of forensic methods Describe how SOCO’s avoid contaminating

How did they…

• Used tape to seal off the crime scene– Police = blue, Crime scene =

yellow

• Wear paper suits, gloves, overshoes, masks to prevent their own traces contaminating scene

• All evidence in sealed, labelled containers– Photographed and videod

Page 8: Forensic Science Introduction to forensics. Learning outcomes Be able to describe a range of forensic methods Describe how SOCO’s avoid contaminating

What evidence?

• Fingerprints• Impressions

– Footprints

• Hair• Fibres• Glass fragments• Chemical compounds• Blood • DNA

Page 9: Forensic Science Introduction to forensics. Learning outcomes Be able to describe a range of forensic methods Describe how SOCO’s avoid contaminating

National DNA Database (NDNAD)

• DNA obtained from crime scene

• Suspect – mouth swab

• 2 DNA profiles compared to NDNAD

• Any match found could lead to conviction

• Used for a whole range of crimes– Murder, sexual assault, car crime

Page 10: Forensic Science Introduction to forensics. Learning outcomes Be able to describe a range of forensic methods Describe how SOCO’s avoid contaminating

Fingerprints on gun

DNA & blood group from blood stain

Shoe size from footprint

Fingerprints on window frame

Fingerprints on glass

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