Many studies have examined the characteristics of the frontal sinuses and their use for forensic purposes, particularly when an individual is edentulous. One of the most widespread classification systems is that proposed by Yoshino et al. The aim of this study was to improve the performance of Yoshino's method for identifying unknown skeletal remains by replacing the first two morphological items, frontal sinus size and bilateral asymmetry, by SOR₁ =left frontal sinus area/left orbit area, and SOR₂ =right frontal sinus area/right orbit area. According to the bivariate distribution of SOR=(SOR₁, SOR₂) and available data, we also estimated the probability of positive misclassification.

This study describes the results of the simultaneous detection and quantitation of morphine, 6-acetylmorphine, and cocaine in toenail and hair samples obtained from 18 forensic autopsies of drug abusers who had died in various manners. After external decontamination, each specimen was submitted to hot acid hydrolysis (1 mL of HCl 37%) in the presence of internal standards, followed by liquid-liquid and solid-phase extraction techniques. The extracts were then derivatized with propionic anhydride and analyzed by gas chromatography-mass spectrometry, operating in the selected ion monitoring mode. The limit of quantitation for all analytes was 0.5 ng on column. Results showed that both cocaine and morphine are more concentrated in toenails than in hair. Mean concentrations were 0.99 ng/mg (toenails) versus 0.48 ng/mg (hair) for cocaine and 1.27 ng/mg (toenails) versus 0.79 ng/mg (hair) for morphine. Distribution of 6-acetylmorphine showed no significant variations between the two (mean concentrations 0.46 ng/mg vs. 0.50 ng/mg in hair).