Before forensic DNA......
Before forensic DNA the best way to place a suspect at the scene of the crime was through finger prints.The down side to fingerprinting was that criminals would just wipe awy the fingerprints or wear gloves. Crime scene investigators needed something that was unique. Something that could not be brushed away so easily. something that was apart of them. Then it was discovered that the best way to find the criminal was not through the arches, loops and whorls on their fingers. The answer was inside the criminal not on the surface. The answer was DNA! After the discovery that DNA could help in crime scene investigation many criminals put behind bars. All because of this amazing technique.