Say a crime has been committed, and the police find either blood or semen at the crime scene. However, the perpetrator has committed no prior crimes and therefore his DNA is in no database or registry. How are analyst able to find out who the perpetrator is through analyzing either the blood or semen found at the scene?
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There’s different types of testing. Commonly this happens when they pool databases of tested profiles. Your parents, siblings, aunts/uncles not married into the family and cousins are used as references. They can given enough supplemental data say that the unknown profile is related and fits into x position of a family tree.
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