Trace & Chemical Evidence
What trace & chemical evidence means
Fibres, glass, drugs and toxicology in the forensic laboratory.
Before you start
Not confident yet? Work through DNA Profiling & Serology first.
Worked example
One question from this skill's own question bank, shown with its full working.
Locard’s exchange principle states that:
- every contact leaves a trace
- all evidence is chemical
- fingerprints never change
- DNA is unique
Working: Locard held that a perpetrator both brings and takes trace evidence from a scene.
Curriculum and exam alignment
Curriculum notes are a general guide to where this work normally sits. Always check the syllabus your school or examination body is currently using.
Related skills
Other Forensic Laboratory Analysis skills in Forensic Science, at the same point in the course.
Other Forensic Science topics
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Practise trace & chemical evidence
8 questions with a worked answer after every attempt, and a SmartScore that tracks how close you are to mastery.