Catching Criminals Using Forensic Evidence

This post answers the following questions

1) What are the three pieces of evidence to look?
2) Why clothing fibres are useful tool used by criminal investigators?
3) How to catch criminals using forensic evidence?
4) What is the role of the forensic computer technician?
5) What will prove that the person was at the scene of the crime?

There are many facets to forensic analysis but perhaps the most important aspect is why it is there in the first place – in its use in a case against a suspected criminal as forensic evidence.

There used to be increased attention given to eye-witness reports to account for criminal activity but as technology has evolved the eye-witness statement is not so heavily relied upon and in its place is the evidence left behind by the perpetrator of the crime as they leave the scene.

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The three pieces of evidence we are going to look at here are fingerprint evidence, hair and fibre evidence and computer evidence.


Perhaps the most well known method of determining the participants of a crime is the fingerprint evidence gathered by the forensic expert. Fingerprints are unique and as such are a perfect way of pinpointing the identification of a criminal perpetrator. Fingerprints can’t be copied and can’t be made to look like another person’s fingerprints, further adding to their use as unquestionable evidence in a court of law. Although many crimes are planned and a criminal may wear a pair of gloves, the majority are opportunistic thefts which have been committed on the spur of the moment. And if fingerprints have been left behind they are the first piece of evidence a criminal layer will use in their case against the accused.

Clothing fibres and hair

If fingerprint evidence is not substantial the forensic technician may turn to clothing fibres or hair found at the crime scene. Hair can be an unquestionable source of evidence as it contains DNA so the question of who it belongs to cannot be in doubt. A DNA match will prove that the person was at the scene of the crime.

Clothing fibres are another useful tool used by criminal investigators as they can be matched to a suspected criminal’s clothing. Fibres are often unique to a particular garment or brand so also act as a good source of evidence.

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IT evidence

The role of the forensic computer technician has grown remarkably over the last few years as more and more crimes are committed using technology. Crimes using computers and other handheld internet connective devices are growing steadily. And even though those who commit computer crime may think that they have disposed of the evidence, there is often a trail left which computer forensic experts can follow to build a detailed picture of the online activities of the computer criminal.

Jude Agnew wrote this article about forensic evidence on behalf of

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