(三) The police find most criminals because somebody tells them who the criminals are. They find other criminals by using science and their computers. When there is a bank robbery, the police first look t 1 their computers for the names of the bank robbers that they know about. Then they go and talk to any of these robbers who are not in p 2 . They ask them where they were when the robbery happened. If any of these people cannot give a good a 3 , the police will often use science to find out if one of them is the robber. Many criminals leave something of themselves at the places of the c 4 like a fingerprint or a hair. Or they take something away on their s 5 or clothes, like dirt or animal hair. If they leave behind some of their b 6 or their hair or a piece of skin, it will have their DNA inside it. Everyone’s DNA is different and their f 7 are also different. So, if a criminal cuts himself during a robbery or leaves his hair, or e 8 a small piece of skin, scientists can find out what his DNA is. The police can then ask the s 9 to give them his hair or some blood and see w 10 it has the same DNA. Many criminals are in prison today because of this kind of evidences