8/12/2019 1-5 Locard's Exchange Principle v1

http://slidepdf.com/reader/full/1-5-locards-exchange-principle-v1 1/17

Uses of Forensic Science 

Art

8/12/2019 1-5 Locard's Exchange Principle v1

http://slidepdf.com/reader/full/1-5-locards-exchange-principle-v1 2/17

Uses of Forensic Science 

William Shakes

Shakespeare(1564  –  1616)

1818 paint

Art

8/12/2019 1-5 Locard's Exchange Principle v1

http://slidepdf.com/reader/full/1-5-locards-exchange-principle-v1 3/17

Uses of Forensic Science 

Reconstruct past events

Drug tests

Archaeology

Sport

International politics

Art

8/12/2019 1-5 Locard's Exchange Principle v1

http://slidepdf.com/reader/full/1-5-locards-exchange-principle-v1 4/17

Uses of Forensic Science 

Bosnian conflict Bosnian c

International politics

Archaeology

Sport

Art

8/12/2019 1-5 Locard's Exchange Principle v1

http://slidepdf.com/reader/full/1-5-locards-exchange-principle-v1 5/17

Uses of Forensic Science 

Disasters 2004 tsunami

International politics

Archaeology

Sport

Art

8/12/2019 1-5 Locard's Exchange Principle v1

http://slidepdf.com/reader/full/1-5-locards-exchange-principle-v1 6/17

Forensic Science 

Being done in fiction booksbefore being done in reality

About 100 years old

8/12/2019 1-5 Locard's Exchange Principle v1

http://slidepdf.com/reader/full/1-5-locards-exchange-principle-v1 7/17

Fictional characcreated by Sir A

Conan-Doyle

8/12/2019 1-5 Locard's Exchange Principle v1

http://slidepdf.com/reader/full/1-5-locards-exchange-principle-v1 8/17

Sir Arthur Conan

Arthur Conan-Doyle 

Eye doctor

Wrote storiesto pass time

8/12/2019 1-5 Locard's Exchange Principle v1

http://slidepdf.com/reader/full/1-5-locards-exchange-principle-v1 9/17

Edmond L(1877  –  19

8/12/2019 1-5 Locard's Exchange Principle v1

http://slidepdf.com/reader/full/1-5-locards-exchange-principle-v1 10/17

Locard’s Exchange Principle 

“Wherever   he steps, whatever he touches, whatever heeven unconsciously, will serve as a silent witness against only his fingerprints or his footprints, but his hair, the fibersclothes, the glass he breaks, the tool mark he leaves, the scratches, the blood or semen he deposits or collects. Alland more, bear mute witness against him. This is evidendoes not forget. It is not confused by the excitemenmoment. It is not absent because human witnesses afactual evidence. Physical evidence cannot be wrong, iperjure itself, it cannot be wholly absent. Only humato find it, study and understand it, can diminish its value.” 

Professor Edmond Locard (1877-

8/12/2019 1-5 Locard's Exchange Principle v1

http://slidepdf.com/reader/full/1-5-locards-exchange-principle-v1 11/17

Locard’s Exchange Principle 

“Wherever   he steps, whatever he touches, whatever he

even unconsciously, will serve as a silent witness against only his fingerprints or his footprints, but his hair, the fibersclothes, the glass he breaks, the tool mark he leaves, the scratches, the blood or semen he deposits or collects. Alland more, bear mute witness against him. This is evidendoes not forget. It is not confused by the excitemenmoment. It is not absent because human witnesses afactual evidence. Physical evidence cannot be wrong, iperjure itself, it cannot be wholly absent. Only humato find it, study and understand it, can diminish its value.” 

Professor Edmond Locard (1877-

8/12/2019 1-5 Locard's Exchange Principle v1

http://slidepdf.com/reader/full/1-5-locards-exchange-principle-v1 12/17

“Every contact leaves a trace” 

Edmond Locard (1877  –  1966)

8/12/2019 1-5 Locard's Exchange Principle v1

http://slidepdf.com/reader/full/1-5-locards-exchange-principle-v1 13/17

Locard’s Exchange Principle 

“Wherever   he steps, whatever he touches, whatever he

even unconsciously, will serve as a silent witness against only his fingerprints or his footprints, but his hair, the fibersclothes, the glass he breaks, the tool mark he leaves, the scratches, the blood or semen he deposits or collects. Alland more, bear mute witness against him. This is evidendoes not forget. It is not confused by the excitemenmoment. It is not absent because human witnesses afactual evidence. Physical evidence cannot be wrong, iperjure itself, it cannot be wholly absent. Only humato find it, study and understand it, can diminish its value.” 

Professor Edmond Locard (1877-

8/12/2019 1-5 Locard's Exchange Principle v1

http://slidepdf.com/reader/full/1-5-locards-exchange-principle-v1 14/17

Obvious traces 

False

Some traces are moreobvious than others

London, 2007

A burglar left hisfalse teeth behind

8/12/2019 1-5 Locard's Exchange Principle v1

http://slidepdf.com/reader/full/1-5-locards-exchange-principle-v1 15/17

Elliott s uilders

Merchants

8/12/2019 1-5 Locard's Exchange Principle v1

http://slidepdf.com/reader/full/1-5-locards-exchange-principle-v1 16/17

More than one wayto leave fingerprintsbehind… 

Obvious traces 

Elliott’s Builders Mer

8/12/2019 1-5 Locard's Exchange Principle v1

http://slidepdf.com/reader/full/1-5-locards-exchange-principle-v1 17/17

Obvious traces 

Diesel inbackyard

Stolen

Severedfinger fo

Hospitalscontacted

Culprit wasarrested &convicted

Attached razto the back w