Tag Archives: Crime scene

Crime Scene Investigation

Crime Scene Investigation, also referred to as CSI.

Crime Scene Investigation is performed by investigators to collect evidences which helps to solve the crime.

Protection of the crime scene is the investigator’s first and important duty.

Career in Forensic Science – Right Decision or Wrong Decision

Hello There,

Forensic Science as an career option is one of the most interesting job it offers you. You don’t have to sit idly and type in your computer, it gives you a field which can draw anybody’s interest full of things and work and, lots of studying and at the same time new research required in this field because it is emerging and it is important to find something that can give early result.

This blog is for those who are confused about this field (Forensic Science), they should pursue it or not.

You want to know if this field is has a vast scope or not.
I want to say that no field is good or bad, the choice, interest and time make it work. Don’t go for higher job opportunities, see if you can grab the only available job with your potential.

Is that field or subject suits your personality?

At This time when everyone is struggling with job crisis then no field is going to provide you one without dedication and knowledge and as you know forensic do not seek for knowledge only it also seek for reasoning, logic, sharpness.

So know yourself first so no one can reject you.

We have made a video on this topic to answer your questions please watch it for details.

Don’t forget to like and comment your opinion on video’s comment section. We want to make sure that everyone understand the good and bad.

Watch This video to know more…

Note:- Always Consult with a good Career Counsellor.(We don’t have one).

A Closer Look on Forensic Science

By @forensicfield

The “A Closer Look on Forensic Science” is the resource to provide comprehensive coverage on Forensic Science. This E-book will help you to gain knowledge about every aspect of Forensic Science, such as; History, Branches, Work, Organization, Crime Scene Investigation, Modus Operandi Bureau, Evidences, etc. This book is going to present an overview of Forensic Science so you will know what is it, why is it, what is the use of it, what is the limitations and much more. This e-book has contains basic knowledge of Forensic Science. Every word that confused you before is going to be solved after reading it.

Contents of The Book

Copyright Information

No part of this e-book may be reproduced or transmitted in any form or by any mean, mechanical or electronic form including recording or photocopying or by any other platform of information storage and retrieval system without permission from publisher of this e-book. If any part of this e-book or whole e-book will be found online on any platform without consent of author and publisher, then it will be decided only in court and compensation will be taken.

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Laws and Principles of Forensic Science

Sources:A Closer Look On Forensic Science written by Archana Singh


Forensic Science is the science which has developed its own Laws and Principles. The Laws and Principles of all the natural sciences are the bases of Forensic Science.

Every object, natural or man-made, has an individuality which is not duplicated in any other object.

1. Law of Individuality

Anything and everything involved in a crime, has an individuality. If the same is established, it connects the crime and the criminal.

This principle at first sight appears to be contrary to common beliefs and observations. The grains of sand or common salt, seeds of plants or twins look exactly alike.

2. Principle of exchange

Contact exchange traces is principle of exchange. It was first enunciated by the French scientist, Edmond Locard. Commonly known as Edmond Locard’s maxim on Interchange.

According to the principle, when a criminal or his instruments of crime come in contact with the victim or the objects surrounding him, they leave traces. Likewise, the criminal or his instruments pick up traces from the same contact.

3. Law of progressive change

“Change is inevitable” , this also applies to object. Different types of objects may take different time spans.

The criminal undergoes progressive changes. If he is not apprehended in time, he becomes unrecognizable.

The scene of occurrence undergoes rapid changes. The weather, the vegetable growth, and the living beings make extensive changes in comparatively short periods.

Samples degrade with time, Bodies decompose, tire tracks & bite marks fade, the firearm barrel loosen, metal objects rust, etc.

4. Principle of comparison

“Only the likes can be compared” is the principle of comparison.

It emphasize the necessity of providing like samples and specimens for comparisons with the questioned items.

A questioned hair can only be compared to another hair sample, same with tool marks, bite marks, tire marks, etc.

For example

A specimen obtained by writing on the same wall, at the same height and with the same instrument and then photographed. It can be matched.

Once handwriting available on a photograph allegedly written on a wall was compared with the specimen written on paper. It did not give worthwhile results.

5. Principle of analysis

The Analysis can be no better than the sample analyzed.

Improper sampling and contamination render the best analysis useless.

The principle emphasizes the necessity of correct sampling and correct packing for effective use of experts.

6. Law of probability

All identification, definite or indefinite, are made, consciously or unconsciously, on the basis of probability.

Probability is mostly misunderstood. If we say that according to probability a particular fingerprint has come from the given source, but it is not a definite opinion.

Probability is a mathematical concept. It determines the chances of occurrence of a particular event in a particular way.

If “P” represents probability, “Ns” the number of ways in which the event can successfully occur (with equal facility) and “Nf” the number of ways in which it can fail ( with equal facility) , the probability of success is given by the formula:

7. Law Of Circumstantial Facts

“facts do not lie, men can and do”

Evidences given by eye witnesses or victims may not always be accurate.

Sometimes victims may intentionally lie or sometimes because of poor senses (such as low sight, unclear hearing), exaggeration & assumptions.

According to Karl Marx “True belief only becomes knowledge when backed by some kind of investigation and evidence”.

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Laws & Principles of Forensic Science

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“A Closer Look On Forensic Science”