Recovering obliterated laser engraved serial numbers in firearms

An easy procedure for recovering obliterated firearms serial numbers, which are laser engraved is presented in this case report. For these serial numbers, the traditional recovering method using acid etching generally fails, once marking the serial number does not necessarily imply a deep permanent deformation of the crystalline array. The standard required mirror-like finish of the surface commonly can destroy any evidence of the original serial number, i.e., can destroy the heat affected zone (HAZ) of only few micra, if it is still present. It is shown in this report that relief polishing and reflected light stereomicroscopy can, in certain cases, successfully reveal obliterated serial numbers, originally marked by laser. The use of this procedure for recovering this type of obliterated serial number is illustrated and discussed with an example we have dealt with.     

The analysis of biological samples from crime scene for a future human DNA profile confrontation. Effects of presumptive test reagents on the ability to obtain STR profiles for human identification

Because of the increase of evidence of blood stains, that have been washed or cleaned in an attempt to mask the analysis of DNA profiles, there is also an increase in the use of presumptive tests on samples sent to laboratories. Some of the presumptive tests, used to identify blood and semen stains, could potentially affect the recovery of high molecular weight DNA from the samples, or extinguish them, especially those already present in small quantities. After the presumptive tests, often these samples are discarded. This study aimed to examine the possibility of obtaining a DNA profile from samples submitted for presumptive testing and cleaned with bleaches with and without chlorine. Two different protocols were conducted: (a) A unique sample of human blood in natura (5 μL), already typed through the DNA techniques with the genetic profile previously known (control), was distributed onto cotton fabrics and dried at room temperature. Four samples of fabric were macerated in saline solution and Coombs serum and then stored for three months (room temperature and freezer −20 °C). (b) Another sample of human blood, type A, in natura, already typed through the techniques of DNA (control) was used. Aliquots of 200 μL were distributed in: cotton, denim and synthetic fabric. The samples were dried at room temperature for 24 h. The blood stains in those fabrics (cotton, denim and synthetic) were then divided into three groups: unwashed, cleaned with chlorine bleach and cleaned with chlorine bleach and soap powder. The samples were again dried at room temperature for 24 h, before the use of luminol. The DNA were extracted with Chelex 100 and amplified with the Identifiler Kit (Applied Biosystems). The blood stains exposed to saline and Coombs serum had DNA profiles consistent with untreated samples (controls). This result shows that the experts should keep and store the samples treated with saline and Coombs serum for future DNA confrontation when necessary. Also discussed in this paper the pattern of blood stains after washing with bleaching solutions, as well as the quantity of DNA obtained from these samples.     

Crime, economic conditions, social interactions and family heritage

This paper tests whether factors referring to socio-economic aspects, family heritage, social interaction, habits and customs explain differences among violent and non-violent prisoners. Some of the results of the probit estimation show that economic issues are the main factors that stimulate the practice of non-violent crime. On the other hand, violent crimes results suggest that factors related to family heritage reduce this kind of crime. In relation to variables of social interaction, prisoners who were brought up in a good neighborhood have a lower probability of committing violent crimes.     

Comparison Among Manual Facial Approximations Conducted by Two Methodological Approaches of Face Prediction

This study verified the difference between two methods of forensic facial approximation (FFA) regarding recognition and resemblance rates. Three‐dimensional models of skulls were obtained from computerized tomography (CT) scans of two subjects (targets). Two manual FFAs were performed for each target, by applying two different guidelines for the facial structures (what we called “American method” (AM) and “Combined method” (CM)). Unfamiliar assessors evaluated the sculptures by recognition and resemblance tests. The AM was that which allowed more correct responses of recognition and higher resemblance's scores for the male target (p < 0.001). Regarding guidelines for modeling characteristics of the face, the ones that are practical and easily performed for sculptures, such as the length of the anterior nasal spine multiplied by 3 for nose prediction, may offer better results in terms of resemblance.     

An HIV-infected psychiatric patient: some clinicolegal dilemmas

The acquired immune deficiency syndrome (AIDS) crisis has raised many clinical and forensic dilemmas for the health-care system. Psychiatrists may encounter particular problems when evaluating and treating human immunodeficiency virus (HIV) infected patients. The authors present a case of an HIV seropositive, bipolar, intravenous drug abusing patient who participates in unsafe sexual practices to illustrate clinicolegal dilemmas involving dangerousness, involuntary hospitalization, confidentiality, and Tarasoff-like duty.     

Y-chromosome STR haplotype diversity in Brazilian populations

A sample of 198 unrelated males distributed among the five geopolitical regions in Brazil were typed for the minimal Y-STR haplotype composed of microsatellite loci DYS19, DYS385I/II, DYS389I, DYS389II, DYS390, DYS391, DYS392 and DYS393. Gene frequency data, gene diversity, haplotype diversity and power of discrimination were estimated. An AMOVA indicated that 99.97% of the haplotypic variation is found within regions and only a small 0.03% and non significant variation is found among the five regions (Fst=0.00031, P-value=0.43). This result suggests that a single national database of Y-STR haplotypes can be used in the quantitative assessment of matches in forensic casework in the Brazilian population. A significant haplotype diversity of 99.8% was found and 172 different haplotypes were observed in 198 chromosomes. Haplotype (14-11, 14-13-29-24-11-13-13) with five occurrences in 198 chromosomes was the most frequent in Brazil.     

Dangerous mentally disordered criminals: unresolvable societal fear?

The average person fears dangerous criminals, especially those suffering from mental illness. Existing mental health and criminal justice systems provide social control for some of these dangerous individuals, but may be inadequate to deal with those mentally disordered offenders who were not found not guilty by reason of insanity (NGI). In California, innovative laws have attempted to address this problem. However, putative lack of efficacious treatment of mentally ill criminals, insufficient economic support, and individual liberty concerns loom as limiting factors in solving the criminal and psychiatric recidivism problem posed by non-NGI dangerous mentally disordered offenders.     

13 STR loci frequencies in the population from Paraíba, Northeast Brazil

As part of a long-term project on Northeastern Brazilians, population genetic data were obtained from 323 unrelated individuals from the state of Paraíba. The loci studied were CSF1P0, TPOX, TH01, vWA, D16S539, D7S820, D13S317, D18S51, D21S11, D8S1179, F13A01, F13B and LPL. Their distributions are in Hardy-Weinberg equilibrium. Forensic parameters were calculated and a comparison was made with geographically nearby populations.     

Dysfunctional Parenting and Intimate Partner Violence Perpetration and Victimization among College Women: the Mediating Role of Schemas

Early Maladaptive Schemas (EMS) are negative cognitions about self and relationships that develop early in life, distort our perceptions of life experiences and are sustained via confirmatory information processing (Young et al. 2003). Although empirical evidence supports the relationship between EMS and psychopathology, there is a relative paucity of research regarding the relationship between EMS and intimate partner violence (IPV). The goal of the present study was to elucidate the complex relations between recollections of dysfunctional parenting, EMS, and IPV victimization and perpetration in adulthood. A sample of 305 women college students completed measures of perceptions of parental bonding, EMS, and relationship conflict behaviors. Results revealed that the EMS of subjugation and self-sacrifice accounted for 13.9% of the variance in IPV victimization; however, the EMS of subjugation was the only significant predictor of IPV victimization and mediated the relationship between recollections of dysfunctional parenting and IPV victimization. Additionally, although the EMS of entitlement, insufficient self-control, mistrust/abuse, abandonment, and social isolation accounted for 11.3% of the variance in IPV perpetration, only the EMS of insufficient self-control and mistrust/abuse were significant predictors of IPV perpetration and mediated the relationship between recollections of dysfunctional parenting and IPV perpetration. Results suggest that these cognitive schemas may be the mechanism through which dysfunctional parenting renders one vulnerable to violence in relationships.