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The fundamental guiding principle that underlies the approaches to
examination of any scene of crime is based on the principle of exchange of
material between objects as formulated by Locard. The Locard's principle states
that "when two objects come into contact there is always transfer of
material from one to the other, and such material may be small or large, may be
difficult to detect, nevertheless it occurs and it is the responsibility of the
investigating team to gather all such material however small they may be and
prove the transference". The perpetrator will take away traces of the
victim and the scene, the victim will retain traces of the perpetrator and may
leave traces of himself on the perpetrator, and the perpetrator will leave
behind traces of himself at the scene.
Crime Scenes can be as varied as crimes. Students in Biology II - Forensic
Science are given crime scenes to sketch and photograph. Young CSIs develop
theories based on what they observe. Each piece of evidence is the potential
clue to break the case wide open.
To view a few crime scenes the class works with, click here.