DNA collection and analysis gives the criminal justice system a great tool for sentencing the guilty and acquitting the innocent. Only one- tenth of a single percent of DNA (about 3 million bases) are different from one person to the next. Scientist can use these regions to make up the DNA profile of an individual, using samples of blood, hair, bone, and most any other body tissues and products. In criminal cases, this usually involves getting samples from crime-scene evidence and/or a suspect, withdrawing the DNA, and surveying the information for the existence of a set of specific DNA types. DNA was first discovered by friedrich Miescher in 1869 at the university of Tubingen, what he called nuclein and the double helix structure was first
