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Principles of Forensic DNA for Officers of the Court

01 Introduction

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DNA Evidence Overview

two photos, one inside of a courtroom and one inside of a lab
National Institute of Justice (see reuse policy).

DNA was first introduced as evidence in the United States court system in 1987. DNA technology has become an increasingly powerful forensic tool for identifying or eliminating individuals as perpetrators of a crime when biological evidence such as saliva, tissue, blood, hair, or semen is left at a crime scene. Outside the courtroom, DNA can provide important investigative leads to resolve issues of human identification.