What is DNA and how is it used in CSI?

What is DNA and how is it used in CSI?

DNA stands for deoxyribonucleic acid, and it is the most significant advancement in forensic science during the past 15 years. The importance of DNA is its ability to link an individual to an item of physical evidence with near-absolute certainty, if not absolute certainty. Anything that an individual may have touched, whether with his or her hands or lips, is a possible candidate for DNA analysis. So investigators at crime scenes must be on the outlook for these items of physical evidence. That has certainly changed the complexion of crime scene investigation in the past 15 years. But it's the link between biological evidence and an individual that can be made with certainty that is the key to understanding the significance of DNA evidence for all investigation today.