John D Gilbert1, Roger W Byard2,3. 1. Forensic Science SA, 21 Divett Place, Adelaide, 5000, Australia. 2. Forensic Science SA, 21 Divett Place, Adelaide, 5000, Australia. roger.byard@sa.gov.au. 3. School of Medicine, Level 3 Medical School North Building, The University of Adelaide, Frome Road, Adelaide, SA, 5005, Australia. roger.byard@sa.gov.au.