Forensic DNA consultantor scientists scan 13 DNA regions, or loci to identify individuals, that vary from person to person and to create a DNA profile of that individual (sometimes called a DNA fingerprint), use the data. Another person has the same DNA profile for a particular set of 13 regions, there is an extremely small chance.

For Forensic Identification, some examples of the uses of DNA are-

• With evidence left at crime scenes, identify potential suspects whose DNA may match

• Exonerate people who have been wrongly accused of crimes

• Identification of the victims of crime and catastrophe

• Establishing relationships in paternity and other family cases

• As an aid to wildlife officials and for prosecuting poachers, identification of endangered and protected species

• Detection of bacteria and other organisms polluting air, water, soil, and food

• In transplant programs, matching organ donors with recipients

• Determination of seed or livestock breeds pedigree

If used intelligently, DNA identification can be quite effective during forensic DNA analysis. Among humans, portions of the DNA sequence that vary the most must be used; also, to overcome the fact that human mating is not absolutely random, portions must be large enough.

It is a great help in person identification, for example, type A blood is found at the crime scene. In about 45% of Americans, Type O occurs. Finding that the "suspect" in a crime is type A really doesn't reveal very much if investigators type only for ABO.

If, the suspect is a blond, in addition to being type A, and blond hair is found at the crime scene, to suggest who really did it, one have two bits of evidence. However, there is a lot of Type A blonds out there but the search becomes narrow.

In this way, forming a chain, by accumulating bits of linking evidence where the set of all of them together is very strong rather each bit by itself which is not very strong, one can argue that a particular suspect really is the right person.

The same kind of thinking is used with DNA; analysts can look for matches which becomes easier as it is dependent on sequence or on numbers of small repeating units of DNA sequence. To be confident, one or two (even three) aren't enough that the suspect is the right one, but thirteen sites are used.

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