Criminal in The family

Crime is said to run in the family, for example if your brother or someone in your family is in jail, then you might have a allele for crime. If they find a DNA sample from a crime seen, and if it the sample is not exactly similar, it could be a family member. If most of the alleles are matching but 3-5 out of the 26 alleles are not matching, should the state have the ability to search for the DNA of their family members. Some say this is a violation of private property. But cross searching DNA in a family could help solve cases, set falsely incriminated people free. So far this technology has been successful in the UK.