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DNA finger printing is an important area of forensic science which is recently used as an important tool in crime detection. Each individual has distinct fingerprints. The criminals too are aware of it and leave no finger prints. The DNA prints are like the finger prints and are used for the similar purposes, the method is often referred as DNA finger printing. With the DNA finger printing technique criminals can be identified because no two individuals have identical DNA prints except the zygotic twins.

So the development of a technique to identify individuals by comparing their DNA with the DNA isolated from a sample of blood or semen or hair base, just a drop of is enough, is revolutionizing the field of forensic investigations. The technique of southern blotting is used to print the DNA of the suspect and the samples collected from the scene of the crime. If the two DNA prints one from the suspect and other from the DNA of the sample collected from the crime site are identical, it undoubtedly proves that the suspect has committed the crime. The technique can also be used to settle paternity disputes with much certainty.