Forensic science is the application of the sciences technology in investigation of crime. This analyzes the culprit in the investigation by applying some scientific techniques in investigation. In investigation they collect the evidence like body fluids, hair, foot print, and soon. They work with legal proceeding, their reports are very important in the judgment of the case. It is not a branch of science but it includes medical, laboratory and some science techniques. Forensic speech science is one of the new branches with forensic science. It is the field entirely depends on the knowledge and knows the entire forensic science techniques. It deals with analysis and examination of physical evidence recovered from the scene of crime. The input, thus provided by the forensic scientists is incorporated by the investigating officer (I O) in preparation of the case for presentation in the court. A forensic scientist may, if required, visit the crime scene to look for trace of evidence. In practice, forensic science draws upon physics, chemistry, biology, and other scientific principles and methods. Forensic science is concerned with the recognition, identification, individualization, and evaluation of physical evidence. Forensic scientists present their findings as expert witnesses in the court of law.