University of Adelaide School of Medicine PhD student, Teghan Lucas, used a database containing anthropometric (face and body) measurements of almost 4,000 individuals to search for duplicate
faces. She found that when seven facial metric traits were used (measurements of the head and facial features), she was unable to find any two faces that matched.
Furthermore, through mathematical equations, she discovered that by using a combination of eight facial metric traits, the probability of finding two faces with the same measurements in the general population was less than one in a trillion. The study was published in the journal
Forensic Science International.