Implications for DNA identification arising from an analysis of Australian forensic databases

Previous analyses of Australian samples have suggested that populations of the same broad racial group (Caucasian, Asian, Aboriginal) tend to be genetically similar across states. This suggests that a single national Australian database for each such group may be feasible, which would greatly facilitate casework. We have investigated samples drawn from each of these groups in different Australian states, and have quantified the genetic homogeneity across states within each racial group in terms of the "coancestry coefficient" F(ST). In accord with earlier results, we find that F(ST) values, as estimated from these data, are very small for Caucasians and Asians, usually <0.5%. We find that "declared" Aborigines (which includes many with partly Aboriginal genetic heritage) are also genetically similar across states, although they display some differentiation from a "pure" Aboriginal population (almost entirely of Aboriginal genetic heritage).     

Stable Isotope Ratios of Marijuana. I. Carbon and Nitrogen Stable Isotopes Describe Growth Conditions*

Abstract: There remains significant uncertainty in illicit marijuana cultivation. We analyzed the δ¹³C and δ¹⁵N of 508 domestic samples from known U.S.A. counties, 31 seized from a single location, 5 samples grown in Mexico and Colombia, and 10 northwest border seizures. For a subset, inflorescences and leaves were analyzed separately. These data revealed a strong correspondence, with inflorescences having slightly higher δ¹³C and δ¹⁵N values than leaves. A framework for interpreting these results is introduced and evaluated. Samples identified as outdoor‐grown by δ¹³C were generally recorded as such by the Drug Enforcement Administration (DEA). DEA‐classified indoor‐grown samples had the most negative δ¹³C values, consistent with indoor cultivation, although many were also in the outdoor‐grown domain. δ¹⁵N indicated a wide range of fertilizers across the dataset. Samples seized at the single location suggested multiple sources. Northwest border δ¹³C values suggested indoor growth, whereas for the Mexican and Colombian samples they indicated outdoor growth.     

A symptom level examination of the relationship between Cluster B personality disorders and patterns of criminality and violence in women

The psychometric properties and structure of the Cluster B Personality Disorder criteria (Antisocial, Borderline, Histrionic, and Narcissistic) are examined in a sample of 261 female inmates using a self-report screen followed by a full diagnostic interview. The results of the structural analyses in this sample demonstrated good internal consistency and convergence, but poor discriminant validity between disorders. An exploratory factor analysis found that the structure of these disorders was best accounted for by a four-factor solution that paralleled the Diagnostic and Statistical Manual (DSM-IV-TR; APA, 2000) classification scheme with some significant and notable exceptions. Using the factor scores generated from the factor analysis, the personality profiles of the women were compared with several behavioral indices, including instant offense, institutional infractions, and self-report violence and victimization within the prison. Of particular importance was the consistent relationship observed between narcissistic personality traits and threatening and violent behavior within the prison combined with the impulsive but less malignant presentation of antisocial personality traits among this sample of women. Results are discussed as they inform our understanding of the structural integrity of the four Cluster B diagnostic categories and the relationship of these personality disorders to different types of criminality and violence.     

I Get By with a Little Help from My Friends: Leveraging Campaign Resources to Maximize Congressional Power

Central to the study of Congress is the study of relationships among members. Electoral collaboration is a function of a member's position in the broader congressional power network. It allows members to leverage their campaign resources to achieve the four classic goals of members of Congress: reelection, making good public policy, obtaining power within the institution, and having one's party in the majority. Using nearly 3.2 million FEC records from 2010 to 2016, we explore the dynamics that influence electoral collaboration. We find members are most likely to collaborate electorally with other members from the same state, party, and committee, and the most electorally vulnerable. Further, party leaders share most frequently with the rank and file. These findings build upon our expanding understanding of congressional collaboration, the networks members of Congress form, and the congressional power structure members operate within.