The document discusses the seven basic principles of forensic science: 1) The law of individuality states that every natural or man-made object has unique identifying features. Extensive work in fingerprints has verified this. 2) The principle of exchange means that when a criminal comes into contact with a victim or crime scene, they leave traces and pick up traces from the contact. 3) The law of progressive change recognizes that everything changes over time, impacting how criminals, crime scenes and evidence can be identified.

1. Principles Of Forensic
Sciences

2. Introduction
The term “Forensic” is derived from the Latin
Word “forensis” which means “the forum”.
Forensic Science is that “scientific discipline
which is directed to the recognition,
identification, individualization and evaluation
of physical evidence by the application of all
principles and methods of natural sciences for
the purpose of administration.”

3. Principles of Forensic Science:-
There are 7 basic principles of Forensic Sciences.
 Law of Individuality.
 Principle of Exchange.
 Law of Progressive Change.
 Law of Comparison.
 Law of Analysis.
 Law of Probability.
 Law of Circumstantial Facts.

4. Law Of Individuality
Every object natural or man made, has all
individual which isnot duplicated in any
other object. The individuality has been
verified in certain fields. The most extensive
work has been carried out in fingerprints. The
law of individuality is of jundamental
importance in forensic science.

5. Principle of Exchange
According to this, when a criminal or his
instrument of crime come in contact with
the victim or the objects surrounding him,
they leave traces, and the criminal or his
instrument picks up traces from the same
contact.

6. Law of Progressive Change
“Every thing changes with the passage of
time”. Its impact on forensic science is
immense. The criminal, the crime scene
and objects involved in the crime all
undergo changes, hence may become
unrecognizable.

7. Law of Comparison
“ Only the likes can be compared”, is the
law of comparison. It emphasizes the
necessity of providing like sample and
specimens for comparison.

8. Law of Analysis
“The analysis can be no better than
the sample analyzed.” the principle
emphasizes the necessity of correct
sampling and packaging for
effective use of experts.

9. Law of Probability
All the identifications, definite or
indefinite, are made consciously or
unconsciously, on the basis of
probability.

10. Law of Circumstantial Facts
“Facts do not lie, men can and do,”
hence the importance of circumstantial
evidence is as good as oral evidence.
Oral evidence depends upon so many
factors such as power of observation,
assimilation, auto suggestion.

11. THANK YOU