Involvement in Internet Aggression During Early Adolescence

The current study examined concurrent and longitudinal predictors of early adolescents’ involvement in Internet aggression. Cross-sectional results (N = 330; 57% female) showed that the likelihood of reporting Internet aggression was higher among youth who spent more time using Internet-based technologies to communicate with friends and who were themselves targets of Internet aggression. Offline relational aggression and beliefs supportive of relational and physical aggression also predicted concurrent involvement in Internet aggression. We used longitudinal data (N = 150; 51% female) to distinguish between youth who were aggressive in traditional contexts only (i.e., school) from those who were aggressive both online and offline. These results indicated that youth who were aggressive both online and offline were older at the initial assessment, were targets of Internet aggression, and held beliefs more supportive of relational aggression than youth who were aggressive offline only. Implications and directions for future research are discussed.     

Intragroup Contact and Anxiety Among Ethnic Minority Adolescents: Considering Ethnic Identity and School Diversity Transitions

Everyday interactions with same-racial/ethnic others may confer positive benefits for adolescents, but the meaning of these interactions are likely influenced by individual differences and larger structural contexts. This study examined the situation-level association between contact with same-ethnic others and anxiety symptoms among a diverse sample of 306 racial/ethnic minority adolescents (Mage = 14 years; 66 % female), based on (1) individual differences in ethnic identity centrality and (2) developmental histories of transitions in diversity between elementary, middle, and high school. The results indicated that at the level of the situation, when adolescents interacted with more same-ethnic others, they reported fewer anxiety symptoms. Further, for adolescents who had experienced a transition in school diversity, the positive benefits of contact with same-ethnic others was only conferred for those who felt that their ethnicity was very important to them. The importance of examining individual differences within larger developmental histories to understand the everyday experiences of ethnic minority adolescents are discussed.     

The Prevalence of Paraphernalia Found at the Scene of Drug‐Related Deaths

Many illicit drugs involve the use of paraphernalia, and the presence of paraphernalia found at the scene of death may suggest that the death is drug‐related. Few sources of objective data are available regarding the prevalence of drug paraphernalia found at the scene of drug‐related deaths or the likelihood of a death with drug paraphernalia found at the scene to be drug‐related. This study reviews the deaths which were investigated by the Bexar County Medical Examiner's Office in an attempt to provide objective data. Over 4000 deaths with scene investigations were reviewed, and the presence of paraphernalia was found to be strongly associated with the death being drug‐related, heroin‐related, or cocaine‐related with the relative risk for each being 5.0, 15.4, and 6.6, respectively. This confirms that the presence of drug paraphernalia at the scene of death strongly suggests the death to be drug‐related and in particular heroin‐related.     

Examining the Effects of Health in Explaining Fear of Crime: A Multi-Dimensional and Multi-Level Analysis

We examine the understudied link between mental/physical health problems and their relationship with perceived unsafety via higher levels of vulnerability. We examine this relationship by linking data at the individual-level, the neighborhood-level, and the county-level using the Portraits of American Life Survey (PALS). Using this data we examine the effect of individual and neighborhood conditions on perceived safety while controlling for county-level crime rates. Findings indicate that higher numbers of physical impairment and mental health issues are independently related to higher levels of perceived unsafety. Both mental and physical health problems are associated with higher levels of fear. These higher levels of vulnerability then directly contribute to higher levels of feeling of unsafety. Unlike past research, we find a mental health link to fear of crime that cannot be explained by physical impairments.     

Survey of crowbar and household paints in burglary cases-population studies, transfer and interpretation

Experimental data useful for the interpretation of paint evidence recovered during burglary cases were obtained. A population study was carried out on 41 blue crowbars seized on suspects in Switzerland and 37 blue paints traces found at burglary scenes. Paint traces were also searched on the blades of 207 crowbars seized by the police in Switzerland and 24 white traces were analysed: these paints were analysed using infrared spectroscopy (FTIR) in order to estimate relative frequencies of each paint type. Simulated contacts were carried out between crowbars and painted wood in order to study the phenomenon of transfer and to evaluate the amount of paint transferred: a total of 198 simulations were carried out including individual, successive and cross transfer. The paint properties such as the chemical composition and its age influenced the amount of paint transferred. Cross transfer from the tool paint to the wood and vice versa was regularly observed. Moreover, secondary transfer of paint coming from the preceding wooden surfaces was also systematically observed: this could establish links between several burglary scenes and a suspected tool. A scenario of a burglary case involving the cross transfer between tool and household paints is proposed as a numerical example: the evaluation of such case was formalised using likelihood ratios based on the experimental data obtained.     

Human-nonhuman chimeras: a regulatory proposal on the blurring of species lines

The chimera of modern biotechnology is defined broadly as a single organism composed of a mixture of materials from two or more organisms possessing distinct genetic backgrounds. Unlike the United States, which does not regulate chimeras directly, Canada has responded to the unregulated pursuit of chimera technology by banning certain chimeras as part of comprehensive legislation designed to regulate human reproductive technologies. In 2004, the Canadian Parliament passed the Assisted Human Reproduction Act despite criticism urging greater legislative justification for the Act's provisions and modification to it statutory definitions. Because current regulatory mechanisms in the United States, including patent law and administrative oversight, fail to regulate chimera technology, the United States should enact new legislation, using Canada's legislation as a model, to prohibit embryonic chimeras and to regulate other human-nonhuman combinations. Unregulated biotechnology threatens to disrupt legal and social institutions; therefore, the United States must make a balanced effort now to protect the public interest.     

Pericarotid bone splinter: a microscopic appearance in hanging

The investigation of the neck structures drawn from 145 cases of asphyxia involving pressure on the neck, for which microscopic examination was required at the Pathology Laboratory of the "Hotel Dieu" Hospital from Lyon, France, during January 1, 1999, to May 1, 2001, has pointed out in 3 cases, besides the classic signs already known, a particular lesion unmentioned yet in the literature, namely, a pericarotid bone splinter, placed in the proximity of the common carotid artery bifurcation. The bone splinters had dimensions between 0.25 and 0.7 mm and a certain antemortem character, surrounded by hemorrhagic areas and by fibrin. The 3 cases deal with adult males who had died through complete hanging, with the knot placed lateral, the hanging mark having the maximum depth in the laterocervical region, correspondent with our finding. Given the location of the bone splinter, we believe that this was produced by the tearing out from the transverse apophysis of the fourth cervical vertebra, as a consequence of the sudden traction during hanging. This sign appeared neither at other types of hanging nor at strangulation by hand or by ligature.     

The fingernails of Mary Sullivan: developing reliable methods for selectively isolating endogenous and exogenous DNA from evidence

The fingernails of Mary Sullivan, the last victim of the Boston Strangler, were examined to determine if any genetic information about the murderer could be obtained. The nails were extremely friable necessitating the development of new techniques for isolating and purifying DNA. DNA yields from nails were optimized by using a NaOH-based preparation technique, which was simple, efficient, and minimized handling. Methods for selectively and thoroughly removing exogenous material on nails were also developed through use of a species-specific PCR assay, wherein mitochondrial DNA from the nail could easily be differentiated from DNA of contaminating cells.