According to the New Jersey lawsuit, police had reopened an investigation into a cold case and had used genetics to place the suspect within a single family: one of several adults or their children. But police didn’t yet have probable cause to obtain search warrants for DNA swabs from any of them. Instead, they asked the state’s newborn screening lab for a blood sample of one of the children.
Analysis of this genetic information revealed a close relationship between the baby’s DNA and the DNA taken at the crime scene, indicating that the baby’s father was the person police were seeking. That was enough to establish probable cause in the
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