evidence: No DNA match for whopping 40% of 9/11 victims — but there’s new progress 23 years later [...] The most recent positive identification came in January when officials used breakthrough DNA sequencing technology to match a profile to John Ballantine Niven, a new dad who was on the 105th floor of the South Tower at the time of the attacks. Four months earlier, the office announced it had also identified the remains of a man and woman, but their names were not made public at the request of the family.