Evaluation of a model of bruising in pigmented skin for investigating the potential for alternate light source illumination to enhance the appearance of bruises by photography of visible and infrared light.

The purpose of this study was to evaluate the ability of alternate light source illumination to enhance bruises in pigmented skin. Previous work was limited to simulating bruises in non-pigmented (Caucasoid type) skin by injecting blood into pigskin. In this study, it was investigated if adding a layer of melanin to the surface of the skin would simulate pigmented skin. The study included evaluating the use of a filter that transmitted infrared light (wavelength greater than 720 nm) in place of the recommended visible light filters for the alternate light sources. The results obtained using pigskin with a layer of melanin were almost the same as results using the naturally pigmented goat ear. This indicated adding a layer of melanin could be used as a model for pigmented skin in this simulation of fresh bruising. Comparing the pigskin without melanin with pigskin with melanin revealed that the optimal light source to enhance the appearance of bruising, simulated by injection of blood, changed from violet to blue-green. Using the infrared transmitting filter resulted in greater enhancement than using the alternate light sources with their recommended visible light filter. The advantage of using the infrared transmitting filter was greater with the pigskin coated with melanin and the naturally pigmented goat ears than in the non-pigmented pigskin, however, the results remain to be validated using real bruises in naturally pigmented human skin.

Turnaround time data for Coronial autopsies - time to complete forensic post-mortem examination reports and influencing factors for Australia and New Zealand in 2015 and 2010.

This study aimed to provide information regarding key performance indicators (KPIs) for forensic pathology in Australia and New Zealand, focusing on the time to complete a Coronial post-mortem examination report. Data was obtained from the National Coronial Information System (NCIS). The mean and median time to complete a post-mortem examination report in 2015 was determined from a sample of 100 cases from each of the nine Coronial jurisdictions. Results of univariate and multivariable analysis of factors potentially influencing the completion time are presented. The multivariable analysis indicated the time to complete a post-mortem examination report was significantly dependent on if any internal examination had been performed, the Coronial jurisdiction and requesting toxicological analysis. The number of days for Coroners to close cases is also presented as well as the number of days for a post-mortem examination to be performed. A comparison between 2015 and 2010 was instigated. However, this data had to be constrained to eight of the Coronial jurisdictions. Within this dataset, the time to complete a post-mortem examination report when an internal examination had been performed was statistically significant greater in 2015. However, the time to complete reports for all Coronial post-mortem examinations in 2015 was not statistically significantly different to 2010. This could be attributed to a higher proportion of post-mortem examinations without internal examination ('external only') in 2015. The time to perform a post-mortem examination following the death being reported to a Coroner increased, but the time for Coroners to close a case decreased.

Investigation into the potential for post-mortem formation of carboxyhemoglobin in bodies retrieved from fires.

The forensic investigation of a deceased person retrieved following a fire includes measuring carboxyhemoglobin. A carboxyhemoglobin saturation above 10% is considered indicative of respiration during a fire, implying the person had been alive. This relies on the assumption that carbon monoxide will not diffuse into blood used for toxicological analysis. This project investigated the potential for carbon monoxide to passively diffuse into a body and if carboxyhemoglobin levels could become elevated post-mortem. Stillborn piglets with intact skin were exposed to carbon monoxide. Carboxyhemoglobin formed in the hypostasis of the skin, but carboxyhemoglobin levels in blood from the heart and chest cavities were not significantly elevated. However, defects in the skin over body cavities (producing breaches to replicate cases with stab wounds or heat damage) resulted in cavity blood carboxyhemoglobin levels above 10%. A review of fire death cases in South Australia 2000-2015 was performed to determine the origin of the blood samples used for toxicological analysis and the incidence of cases with breaches of body cavities. This revealed a small number of cases in which blood from the cavities had been analyzed when cavity breaches were present. Thus, there is a potential for significant elevation of carboxyhemoglobin saturation post-mortem in forensic casework involving bodies retrieved from fires.

Review of autopsy reports of deaths relating to fire in South Australia 2000-2015.

It has been noted there are gaps and inconsistencies in data pertaining to fire related deaths in Australia, which poses difficulties for analysis of national statistics. A search of post-mortem examination reports at Forensic Science SA from 2000 to 2015 revealed 275 cases regarded as fire related in which the body had been involved in a fire. The autopsy reports were evaluated to determine parameters including the location of the fire event, age and sex of victim, as well as the presence of soot in the airways and cherry-red coloration to the blood and/or organs, in addtion to toxicological levels of carboxyhemoglobin and alcohol. Fire events were clasified as structural, transportation or open air in type. Males were more commonly victims than females, especially in transportation fires, where males aged below 50 years were most at risk of death. Carboxyhemoglobin levels tended to be lower in victims of transportation fires. This study has confirmed that presence of soot in the respiratory tract and cherry-red coloration of a body retrieved from a fire are both linked to an increased level of blood carboxyhemoglobin. These findings significantly contribute to the documentation of fire deaths in Australia.