How does forensic identification work?

Any type of organism can be identified by examination of DNA sequences unique to that species. Identifying individuals within a species is less precise at this time, although when DNA sequencing technologies progress farther, direct comparison of very large DNA segments, and possibly even whole genomes, will become feasible and practical and will allow precise individual identification.
To identify individuals, forensic scientists scan 13 DNA regions, or loci, that vary from person to person and use the data to create a DNA profile of that individual (sometimes called a DNA fingerprint). There is an extremely small chance that another person has the same DNA profile for a particular set of 13 regions.
Some Examples of DNA Uses for Forensic Identification

• Identify potential suspects whose DNA may match evidence left at crime scenes
• Exonerate persons wrongly accused of crimes
• Identify crime and catastrophe victims
• Establish paternity and other family relationships
• Identify endangered and protected species as an aid to wildlife officials (could be used for prosecuting poachers)
• Detect bacteria and other organisms that may pollute air, water, soil, and food
• Match organ donors with recipients in transplant programs
• Determine pedigree for seed or livestock breeds
• Authenticate consumables such as caviar and wine