The function of a “forensic scientist” is to apply principles and techniques from physical and natural sciences to the analysis of different types of evidence recovered from the crime scene. Like DNA matching, finger prints, drug identification etc.
They use the principles of biology, to obtain and analyze evidence from variety of sources, including blood and other body fluids, hairs.
As a forensic scientist they must use biology in determining how a crime occurred.
1) Blood grouping and DNA profiling.
2) Analyzing fluid and tissue samples for traces of drugs and poisons.
Crime lab professionals compare body fluids and hair for typing factors, including DNA analysis. DNA analysis determines how frequently parts of a persons genetic code are found in the population forensic scientists isolate DNA stands from an individuals body fluids to compare the persons unique DNA to the DNA of a sample of others in a database. Because of its accuracy, DNA analysis has grown popular in two years.
Analysis of a hair found at a crime scene can determine factors such as whether the hair belongs to a human or animal, the body area a hair came from, diseases the person or animal has, and sometimes, race. And through simple side-by-side examination, hair comparisons can match a hair found at a crime scene to the person who left it there.