Crime is as old as humankind, and justice as old as civilized society. With the passage of time, the methods of crime and systems of justice have evolved. While yesteryears' systems of justice were rather crude and barbarous, today's legal system looks for "Evidence beyond reasonable doubt".

Today in India and many other democratic nations, the judiciary requires convincing evidence to convict the suspect. Many a times it is difficult to produce eyewitnesses or oral evidence and in a few cases where such evidence is available, it is known to have many limitations and shortcomings. It is on account of lack of substantial evidence that about 90 percent of cases are ending in acquittal. In order to avoid common man loosing confidence in the criminal justice system, it is imperative to seek ways and means to improve the credibility of the system, by adequately making use of the advances and advantages in modern Science & Technology.