, SEP1503
ASSIGNMENT 1 SEMESTER 2
2026
DUE AUGUST 2026
QUESTION 1: The Locard Principle and its Application
Understanding the Locard Principle
The Locard Principle, formulated by Dr. Edmond Locard, is a foundational concept in forensic
science. According to Locard, "every contact leaves a trace" . This means that whenever two
objects or persons come into contact with one another, a mutual exchange of material occurs. The
criminal will leave traces of themselves at the crime scene, and simultaneously, they will take
traces of the scene away with them on their person or clothing. This principle underscores that
evidence is not confined to the crime scene alone but can also be found on the perpetrator, making
the suspect's body an extension of the crime scene itself.
Application to the Case
In this specific case, where the victim scratched her attacker, the Locard Principle is directly
applicable in several ways to link the suspect to the crime.
Firstly, the suspect's biological material would have been transferred to the victim. When the
complainant scratched the man's face, his skin cells and possibly blood would have lodged
underneath her fingernails. According to forensic experts, fingernail scrapings are a valuable source
of trace evidence in assault cases. By carefully collecting and analysing the material from under the
victim's fingernails, the SAPS forensic laboratory could extract DNA that matches the suspect. This
would provide a direct biological link between the suspect and the victim, confirming physical
contact.
Secondly, the victim's trace evidence would have been transferred to the suspect. When the victim
scratched the attacker, her own skin cells or fibres from her clothing could have been transferred
to the suspect's fingernails or clothing. Additionally, the suspect's face would likely bear scratch
marks consistent with the victim's fingernails. A forensic examination of the suspect would reveal
these injuries, and photographs or medical reports of the scratches could be compared to the
victim's fingernail shape and size, providing further corroborative evidence.
ASSIGNMENT 1 SEMESTER 2
2026
DUE AUGUST 2026
QUESTION 1: The Locard Principle and its Application
Understanding the Locard Principle
The Locard Principle, formulated by Dr. Edmond Locard, is a foundational concept in forensic
science. According to Locard, "every contact leaves a trace" . This means that whenever two
objects or persons come into contact with one another, a mutual exchange of material occurs. The
criminal will leave traces of themselves at the crime scene, and simultaneously, they will take
traces of the scene away with them on their person or clothing. This principle underscores that
evidence is not confined to the crime scene alone but can also be found on the perpetrator, making
the suspect's body an extension of the crime scene itself.
Application to the Case
In this specific case, where the victim scratched her attacker, the Locard Principle is directly
applicable in several ways to link the suspect to the crime.
Firstly, the suspect's biological material would have been transferred to the victim. When the
complainant scratched the man's face, his skin cells and possibly blood would have lodged
underneath her fingernails. According to forensic experts, fingernail scrapings are a valuable source
of trace evidence in assault cases. By carefully collecting and analysing the material from under the
victim's fingernails, the SAPS forensic laboratory could extract DNA that matches the suspect. This
would provide a direct biological link between the suspect and the victim, confirming physical
contact.
Secondly, the victim's trace evidence would have been transferred to the suspect. When the victim
scratched the attacker, her own skin cells or fibres from her clothing could have been transferred
to the suspect's fingernails or clothing. Additionally, the suspect's face would likely bear scratch
marks consistent with the victim's fingernails. A forensic examination of the suspect would reveal
these injuries, and photographs or medical reports of the scratches could be compared to the
victim's fingernail shape and size, providing further corroborative evidence.
