Seasonality of insect succession and pig carcass decomposition in a natural forest area in southeastern Brazil

In this study, successional patterns, relative abundance of larvae and adults of sarcosaprophagous insects, carcass decay, diversity and seasonality of species, and their potential as forensic indicators were studied. Four experiments were carried out in each season in a natural area of southeastern Brazil. Two pigs (Sus scrofa L.) were used in each experiment and were exposed to sunlight and shade, respectively. The Calliphoridae outnumbered the Sarcophagidae in specimens collected and reared from the carcasses. More insects were collected from carcasses exposed to the sun, while a larger number of specimens were reared from those in the shade. Temperature and rainfall influenced the stages of carcass decay and insect activity and abundance. Chrysomya albiceps was the most abundant species in all four experiments. The carcasses were used as a protein source and substratum for oviposition. The dark putrefaction and fermentation stages yielded more flies than the other stages. These results show that flies are important in carcass decay and are, therefore, also of forensic importance. Seven species can be considered valuable forensic indicators in Southeastern Brazil. However, only three species were useful as forensic indicators in wooded areas: P. intermutans, H. segmentaria, and H. semidiaphana.     

Analysis of DNA in minute volumes of blood from stains and crusts

As the first step, the locus D1S80 was amplified by the polymerase chain reaction technique from genomic DNA extracted from artificial bloodstains and crusts with different amount of blood (32 microl, 16 microl, 8 microl, 4 microl, 2 microl, and 1 microl). In all samples of bloodstains and crusts, identification by DNA analysis was possible. As the second step, the locus HLA-DQA1 was amplified from genomic DNA extracted from diluted blood samples (640, 320, 160, 80, 40, 20, 10, and 5 leukocytes). DNA amplification was possible in diluted blood samples with at least 10 leukocytes. Considering the conditions in which the present study was carried out, it was possible to conclude that 1 microl of bloodstains or crusts was enough for identification. It was also concluded that five leukocytes are not enough material to render consistent DNA identification.     

Predicting symmetry in female/male crime rates

This paper examines changes in female criminality. Data were obtained from 1943 through 1998 on six index crimes: murder, robbery, assault, burglary, auto theft, and larceny. Rape and arson are not included because rape is almost exclusively a male crime, while statistics for arson have not been consistent for the period studied. A review of the literature on female crime is presented. Percentage differences between males and females were obtained for specific crimes for each year. A regression line was computed for this difference by year. Each line is characterized by R², as a measure of confidence in future predictions and “b” levels to determine slope, and the expected year in which male and female crime will achieve equality if current trends continue. The authors also suggest using the year generated as an index on which to compare growth or decline of female crime.     

Methods for the analysis of hard dental tissues exposed to high temperatures

The preservation of teeth that have been exposed to a heat source is a key factor in order to keep their value as evidence. This research paper presents some methods under development for the analysis of dental evidence after exposure to high temperatures; it also establishes age related alterations of young and aged teeth which have been exposed to direct heat. A total of thirty permanent healthy teeth (young=15 and old=15) were submitted to direct heat (n=14) and to a controlled raise of temperature (n=16); they were embedded in polymethylmetacrilate. For the macroscopic study, blocks were cut in half, polished and their surfaces were digitalized. Subsequently, blocks were put in slides, worn away and observed through a photomicroscope. The study of the colorimetric pattern was done by Corel Photo Paint 12.0 and Image J. software. All teeth submitted to the gradual raise of temperature presented a degree of structural damage lower than those exposed to direct heat. The internal surface of young teeth exposed to direct heat showed lines of fracture oblique to the long axis of the tooth; in contrast, a reticular pattern was observed on aged teeth. All teeth exposed to direct heat showed some matte-black coloration areas, while those submitted to a gradual increment of temperature showed a greyish colour in the enamel and a chalky-white in the cementum. By using both thermal treatments in young teeth, the amelodentinal junction was lost, thus preserving the integrity of each tissue. In aged teeth, the separation of this junction was produced because of the breakdown of the dentine. Microscopically, in teeth exposed to direct heat, it was neither possible to differentiate the dentin from the cementum, nor to distinguish the incremental lines of the latter; while in those submitted to a controlled increment of temperature, the corresponding morphology in the tissues was observed. A significant statistical difference was obtained for black colour among young and aged teeth exposed to direct heat, as well as among the means of all colours obtained from the teeth exposed to both treatments. The structural changes observed allow locating a tooth in the studied age groups. Our results show the viability of the applied method for the processing of samples, allowing their preservation as evidence during an indefinite time.     

Influence of ballistic and autopsy parameters on the manner of death in case of long firearms fatalities

A retrospective study was carried out on 132 fatalities due to gunshot wounds secondary to long firearms. One group of suicide (n=72) and one group of homicide (n=60) were statistically compared regarding age and sex of the victim, number of shots, range of fire, direction of the projectile(s), anatomical distribution of entrance sites, weapon and ammunition types and the nature of eventual associated traumatic lesions. The frequency of suicide was higher when the victim's age increased. Females constituted about 43% of the homicide victims and about 8% of the suicide victims. 51.5% of the homicide victims and about 10% of the suicide victims had sustained more than one gunshot wound. Close range was respectively found in 53.5% of the homicide cases and in all suicide cases. Most of the suicide cases (85% of the cases) showed typical entrance sites. Entrance sites in the limbs and lateral or posterior wall of the chest were only encountered in homicide cases. Associated traumatic lesions were found in about 23% of the homicide cases and in 18% of the suicide cases. In case of suicidal gunshots to the left chest, both upwards and downwards directions, and also both right-to-left and left-to-right directions can occur. From 22 suicide cases showing entrance wound in the mouth, a downwards direction was found in only one. This study underlines the importance but also the limits of the autopsy findings (including direction of the projectile(s) related to the entrance site) for giving an indication of the manner of death (homicide vs. suicide).     

Alcohol and drug consumption among sexual offenders

Purpose

To evaluate the role of alcohol and drug consumption between sexual offenders against boys and girls.

Method

It was an observational, retrospective and cross-sectional study carried out by the Ambulatory for the treatment of sexual disorders of ABC Medical College, Santo André, São Paulo, Brazil (ABSex). The sample comprised 104 convicts, over 18 years old, sentenced only for sexual crimes against children (below 11 years old). Alcohol and drug consumption, sexual abuse history, sexual impulsivity, and risk of recidivism were evaluated.

Results

The sexual offenders against boys showed higher alcohol consumption problems than sexual offenders against girls (χ² = 19.76, 1 d.f., p < 0.01). The severity of alcohol consumption was also significantly higher in the sexual offenders against non-related boys than in the sexual offenders against non-related girls (p = 0.037, ANOVA). After adjustment for other variables, such as monthly income before the penalty and alcohol consumption at the moment of the crime, the alcohol consumption severity in sexual offenders against boys was significantly higher than in sexual offenders against girls (OR = 1.05, CI 1.01–1.08, p < 0.01).

Conclusions

Alcohol use or abuse is associated with the perpetration of sexual aggression. The role of alcohol consumption seems to be greater in sexual offenders against boys than in girls and this can contribute to criminal recidivism.     

A media campaign prevention program for child sexual abuse: community members' perspectives

This study examines the face validity and feasibility of materials included in a multimedia child sexual abuse (CSA) prevention campaign. A quantitative survey method assessed participants' comfort level, knowledge gain, and likelihood of behavioral change in response to the media campaign. Furthermore, a focus group method explored participants' attitudes and opinions regarding the campaign and the unique effects of ethnic or cultural norms on participants' acceptance of the media materials. Six groups, established based on participant ethnicity (i.e., three Caucasian groups, two African American groups, one Hispanic group), met at two sites in the Charleston, South Carolina, area. Quantitative data suggest that participants reported increased CSA knowledge and low levels of discomfort or anxiety related to exposure to the materials. Focus group results suggest that study participants, regardless of ethnic background, agreed that the media campaign can have a positive impact on public knowledge of CSA. Implications and directions for future research are discussed.     

Outcome of early onset anorexia nervosa: What do we know?

Six recent studies on the outcome of early onset anorexia nervosa (AN) are reviewed. It would appear that the intermediate term outcome of early onset AN is not different from that of later onset AN. No prognostic indicators were identified and effect of treatment is unknown. Early onset AN may be a disabling and chronic disorder for 25% of patients seen at psychiatric clinics.Received M.D. from the University of Hong Kong, Faculty of Medicine. Major research intersts are eating disorders and cross-cultural psychiatry.     

Complainants’ Views about Civilian Review of the Police: A Study of the Philippines

In search of effective control of the police, several countries have created civilian review boards. The Philippines recently adopted such an approach by establishing the People’s Law Enforcement Board (PLEB). The board is envisioned to enable citizens to participate in the process of police control. This study examines the perceptions of complainants about the board in a metropolitan area in the Philippines. Using surveys, the study aims to determine the integrity, legitimacy, and efficiency of the board as well as the satisfaction of complainants with the review board. The findings suggest that complainants were highly satisfied with the People’s Law Enforcement Board. Complainants also showed great concern for the legitimacy of the board and the timely resolutions of their cases. In addition, the study confirms previous studies’ findings on the predominant influence of case outcomes on complainants’ satisfaction.