Classification of premium and regular gasoline by gas chromatography/mass spectrometry,principal component analysis and artificial neural networks

Detection and correct classification of gasoline is important for both arson and fuel spill investigation. Principal component analysis (PCA) was used to classify premium and regular gasolines from gas chromatography-mass spectrometry (GC-MS) spectral data obtained from gasoline sold in Canada over one calendar year. Depending upon the dataset used for training and tests, around 80-93% of the samples were correctly classified as either premium or regular gasoline using the Mahalanobis distances calculated from the principal components scores. Only 48-62% of the samples were correctly classified when the premium and regular gasoline samples were divided further into their winter/summer sub-groups. Artificial neural networks (ANNs) were trained to recognise premium and regular gasolines from the same GC-MS data. The best-performing ANN correctly identified all samples as either a premium or regular grade. Approximately 97% of the premium and regular samples were correctly classified according to their winter or summer sub-group.     

Y-chromosomal STR haplotypes in Inuit and Danish population samples

Nineteen Y-chromosomal short tandem repeats (STRs), DYS19, DYS389-I, DYS389-II, DYS390, DYS391, DYS392, DYS393, DYS385, DYS388, DYS434, DYS435, DYS436, DYS437, DYS438, DYS439, DYS460, DYS461 and DYS462 were typed in Inuit (n=70) and Danish (n=62) population samples.     

The inpatient evaluation and treatment of a self-professed budding serial killer

The authors present the case of a man who was hospitalized after claiming that he was about to become a serial killer. The patient presented with extensive written homicidal fantasies and homicidal intentions without evidence of actual homicidal acts. In addition to routine assessments, hospital staff members used case conferences, psychological testing, outside forensic consultation, and a forensic review process to make decisions regarding diagnosis, treatment planning, and discharge. The patient was discharged after 8 months of inpatient treatment and was apparently free of homicidal impulses or symptoms of severe mental illness. A 2-year court commitment allowed for the enactment and potential enforcement of a discharge plan that was endorsed by the patient, the hospital, and community care providers. The authors review diagnostic and risk management issues. Comparisons with known features of typical serial killers are made.     

Preventing filicide in families with autistic children

Autism is a complex neurodevelopmental disorder that affects social behaviors and parent-child interaction. It has been associated with an increased risk of social victimization, and a recent rise in number of acts of filicide of developmentally disabled children has included several cases of autism. In this article, possible risk factors for filicidal behavior in families with autistic children and prevention strategies are reviewed.     

Taphonomic mycota: fungi with forensic potential

Forensic archaeologists and criminal investigators employ many different techniques for the location, recovery, and analysis of clandestine graves. Many of these techniques are based upon the premise that a grave is an anomaly and therefore differs physically, biologically, or chemically from its surroundings. The work reviewed in this communication demonstrates how and why field mycology might provide a further tool towards the investigation of scenes of crime concealed in forest ecosystems. The fruiting structures of certain fungi, the ammonia and the postputrefaction fungi, have been recorded repeatedly in association with decomposed mammalian cadavers in disparate regions of the world. The ecology and physiology of these fungi are reviewed briefly with a view to their potential as a forensic tool. This application of mycology is at an interface with forensic archaeology and forensic taphonomy and may provide a means to detect graves and has the potential to estimate postburial interval.     

Suicides by fall from height in Geneva,Switzerland, from 1991 to 2000

Suicides due to fall from height in Geneva from 1991 to 2000 were reviewed. Scene investigations, autopsy findings, psychiatric histories, and toxicology results were examined. There were 197 of these suicides, an incidence of five cases per 100,000 inhabitants per year or one fourth of all suicides in Geneva per year. Autopsies were performed on 33%, the rest had external examinations. Of the victims, 56% were female and 44% were male. The age distribution peaked at 20-29 years in men and 60-69 years in women. Most of the victims jumped from their home, the range of 2 to 7 stories being the most frequent height. Major injury sites, in decreasing frequency, were the thorax, abdomen, skull, vertebrae, pelvis and limbs. Psychiatric illness was reported in 38% of the cases. Toxicological analysis was performed in 25% of the cases and showed that the main drugs present were benzodiazepines, cannabis and antidepressant.     

A potential metallographic technique for the investigation of pipe bombings

This study was conducted in an attempt to develop a metallographic method for the investigation of pipe bombings. Three common pipe materials, ASTM A53 steel, AISI 304L stainless steel, and 6061-T6 aluminum, were shock-loaded using five high explosives and three propellants. The explosives used were ANFO, Composition C4, C6 detasheet, nitroglycerine-based dynamite, and flake TNT. The propellants used were FFFFg black powder. Red Dot smokeless powder, and Turbo Fuel A. The post-blast microstructure, hardness, and, in the case of 304L, transformed martensite content were examined for each test. The damage done to the microstructure was found to increase with increasing detonation velocity of the explosives and increase in pressure generated by the shock-metal interaction. Material hardness and, in the case of 304L, martensite content showed a sharp increase followed by a plateau as the shock pressure and detonation velocity increased.     

Shifting Conceptions of Sexual Discrimination at the Court of Justice: from P v S to Grant v SWT

Decisions of the Court of Justice have challenged traditional notions of sexual discrimination. In P v S and Cornwall County Council, the Court held that discrimination against transsexuals was contrary to the 1976 Equal Treatment Directive. However, in Grant v South‐West Trains, the Court rejected arguments that Article 119 on equal pay prohibited discrimination on the basis of sexual orientation. This article contrasts the two decisions, and in particular focuses on the inconsistencies in the Court's definition of what constitutes sexual discrimination. The article further considers the underlying factors which may have influenced the Court's judgment, including the moral dimension and the political context of the two decisions. Finally, there is a discussion of the merits of equality litigation strategies, in particular at the Court of Justice.