by 
The Curious Bag
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There are 13 regions (loci) in the human DNA that contain information that is unique to each individual. Forensic scientists use the DNA information collected from tissue samples (such as hair, skin and saliva) to create a unique DNA fingerprint.
Accuracy
DNA analysis is the most precise and advanced technology available for determining identity. There is only a one-in-a-billion chance that any two people will have the same 13-loci DNA profile.
Purpose
DNA analysis is used for a number of purposes, including: identifying criminals and victims, determining parenthood, detecting organisms, disease susceptibility, and matching organs for transplant recipients.
Database
The DNA information of known criminals and offenders is stored in a national database called the National DNA Index (NDIS). According to the FBI, there are more than 7 million records stored in the NDIS.
Law
DNA profiling of sex offenders is mandatory in all 50 states, while 44 states require DNA profiling of convicted felons. DNA profiling for misdemeanors and arrests is required in 9 states and 11 states, respectively.
Types
Techniques used for analyzing DNA include: Restriction Fragment Length Polymorphism (RFLP), Y-Chromosome Analysis, Mitochondrial DNA Analysis, STR Analysis, and PCR Analysis
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