The DNA with exceptional identical twins are basically found in blood cell. For example blood, skin, saliva, semen, and hair follicles are the essential DNA during the crime test. There are different DNA techniques to investigate the crime, such as RELP, PCR analysis, STR analysis, mitochondrial analysis, and Y chromosome analysis. RELP is the first DNA investigation application. To analyze DNA, forensic scientists use a specialized enzyme to analyze the different lengths of DNA from digesting result. PCR anaylsis is to use millions of exact copies of DNA from a biological sample. The STR analysis is to evaluate the specific region of DNA.
http://www.ornl.gov/sci/techresources/Human_Genome/elsi/forensics.shtml
http://www.ornl.gov/sci/techresources/Human_Genome/elsi/forensics.shtml
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