DNA banking is the secure, long term storage of an individual’s genetic material. DNA is most commonly extracted from blood, but can also be obtained from saliva and other tissues. DNA banks allow for conservation of genetic material and comparative analysis of an individuals genetic information. Analyzing an individuals DNA can allow scientists to predict genetic disorders, as used in preventive genetics or gene therapy, and prove that person's identity, as used in the criminal justice system. There are multiple methods for testing and analyzing genetic information including restriction fragment length polymorphism (RFLP) and polymerase chain reactions (PCR).