Things have come a long way since the days of Sherlock Holmes, when the only tools a detective had were a sharp eye, a magnifying glass and a logical mind. Now police and scientists have many new tricks to help solve mysteries and crimes (forensic science).
Just like fingerprints, every human has unique DNA. Scientists have found ways to tell one person’s DNA from another person’s; but unlike fingerprints, which can be changed using. surgery, you can’t change your DNA. Also, unlike fingerprints, which are only left at a crime scene if a person touches a suitable surface with bare fingers, DNA is tucked away in the centre of every cell in your body. DNA can be extracted from hairs, skin cells, blood, skeletons, bits of bone, teeth and body…
