DNA has changed the way we investigate crimes, it has made it easier to find the culprit and solve hard cases about the cause of death or murder. Now detectives can take DNA from a suspect killer and DNA from the victim or from the person murdered. From there the detectives can test the DNA on the suspect and the DNA on the victim to see if they match. If the DNA matches then the case moves up another notch and the police is one step closer to catching the person who committed the crime. For example, if a person was murdered the detectives would try to collect as much DNA samples that could be found on the person. A piece of hair or even a piece of skin could lead to the killer, if the victim had put up a fight and scratched the murder before dying then the detectives would be able to take the skin samples from under the nails and extract the DNA from the skin sample and use it to match it with a possible suspect. DNA can be left anywhere like fingerprints, in another case a handgun was left so the police and detectives were able to collect the DNA left on the handgun and matched it to the one in the database and soon they found a match and led to the arrest. If it was an angry killer, detectives might even be able to find DNA in the victims eyes, because there might be saliva inside or on the face where some of the spit may have landed. They could easily find if the spit is of the victim or of another person by comparing it to the saliva from the victims mouth. The two main DNA test are called RFLP and PCR. Before DNA was discovered it was hard for detectives to catch a criminal because the only way was to find evidence from a set up or catching the curpit repeating the crime. Now thanks to DNA detectives have a slightly easier job. RFLP is a sequence of DNA that ends with a target and a sequence between, PCR is a DNA amplifier.
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