Dna

From 911Encyclopedia:

On July 12th, 2002 the NY Times reported, that disturbingly of the 2,823 people believed killed in the terrorist attack, 1,229 victims -- fewer than half -have been identified, 519 by DNA alone. The rest seemed to have been pulverized. Dr. Robert Shaler, the city medical examiner's chief of forensic biology, said in an interview that the medical examiner's office will exhaust all available forensic technology in an undertaking expected to last until the end of 2002. Source: http://library.northernlight.com/EC20020712690000013.html?dx=1006&rq=0#doc