It would ordinarily be too late for man serving life sentence for 1972 murder to challenge his conviction, but the feds waive objections. Expert testimony that his hair was “microscopically identical” to hair found at the crime scene was unreliable. (The feds have been reviewing cases involving such hair identifications since 2012.) Feds: Nevertheless, there was plenty of other evidence he’s the murderer. District court: Yup, the conviction stands. D.C. Circuit: We think not.