Denver police this year tracked down a car theft suspect using his brother 's DNA . Investigators compared blood DNA from the scene to records in a criminal database . Then , as part of a study being conducted by the district attorney 's office , investigators used new software to see whether the DNA in the blood was close enough to potentially be from a family member of someone in the criminal DNA database . They found that the same man had been arrested for stealing cars before, and was later charged with murder after he killed someone else. A defense attorney says it violates a person 's `` reasonable expectation of privacy ''
Denver police this year tracked down a car theft suspect using his brother 's DNA . Investigators compared blood DNA from the scene to records in a criminal database . They found that the same man had been arrested for stealing cars before, and was later charged with murder after he killed someone else. A defense attorney says it violates a person 's `` reasonable expectation of privacy ''