Forensic science has come a long way from relying on instinct and confessions to the present day use of blood samples to solve crimes. Scientists discovered that there exists different blood types; A, B, AB and O.

This later helped forensic scientists to eliminate some suspects and remain with only those suspects who displayed blood groups similar to those at the crime scene. In 1933 Francis Crick and James Watson discovered that every human cell contains the Deoxyribonucleic acid commonly known as DNA which is unique to every individual. It is possible to identify the perpetrator of a crime by analyzing the suspect’s DNA and comparing it to the blood sample or finger prints at the crime scene (Lee and Frank, p.338). Blood is certainly an important bodily fluid and tissue.

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