Post on 03-Jun-2018
transcript
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