Description: Many substance users deny their substance use to avoid negative consequences, thus diluting the accuracy of assessment. To address this issue, indirect items are often included on substance use measures to identify those who deny their use. The purpose of this study was to examine the effect of complete denial and partial denial on substance use measures. Partial denial, also termed denial of effects, is the denial of substance use interfering in multiple domains of a person's functioning. The study used a mixed within- and between-subjects design with participants from a dual diagnosis inpatient unit. Each participant completed the study under two different conditions which include an honest condition and an experimental condition (either complete denial or partial denial). Results show that partial denial is distinctly different from complete denial across three self-report substance use measures. Importantly, substance users engaging in these denial conditions were often undetected by these measures.

Description: Aggression has traditionally been subdivided into two correlated, but distinct, subtypes: reactive and instrumental. Reactive aggression (RA) is considered impulsive, emotionally driven behavior, whereas instrumental aggression (IA) is planned and incentive-motivated. This thesis examines the relationships between RA, IA, psychopathy, and antisocial personality disorder (APD) symptoms in male and female offenders recruited from a jail in north Texas. Contrary to predictions, psychopathic traits did not account for more variance in aggression than did APD symptoms. Impulsivity demonstrated slight incremental validity over psychopathy for RA, and to a lesser degree, IA. the continued utility of the reactive-instrumental distinction and implications for professional practice in relation to the current study are examined. Study limitations and directions for future research are discussed.

Description: A vigorous debate persists in the literature about the efficacy of clinical judgment and actuarial models of risk assessment. This study was designed to augment those commonly used methods by integrating a variety of factors that produce risk and protective effects among 101 youthful offenders. Adolescents and young adults in a maximum-security facility were interviewed with the Psychopathy Checklist: Youth Version (PCL:YV), and completed self-reports of psychopathy, impulsivity, and perceived parental care and protection. This selection of empirically-supported predictors was enhanced by criminal history and family information obtained through extensive file review. Markedly different prediction models emerged based on age. ADHD and PCL Factor 2 predicted adolescents' institutional maladjustment. In contrast, young adults' institutional behavior was influenced by impulsivity, family substance abuse, and gang membership. Treatment progress also differed depending on age; the absence of certain risk factors predicted success for adolescents, while academic achievement and intelligence facilitated young adults' advancement. Importantly, support was demonstrated for the moderating effects of protective factors on violence. Finally, the predictive validity of newly-developed psychopathy self-reports was examined in relation to the PCL:YV. Both the SALE PS-24 and the APSD were modestly effective at differentiating between high and low levels of psychopathy.

Description: The accurate determination of malingering relies on the use of validated and clinically relevant assessment measures. Simulation design is the most often-used research design to accomplish this. However, its external validity is sometimes questioned. The goal of the thesis was to systematically evaluate these major elements: situation, incentives, and coaching. The situation in simulation studies can vary from relevant (academic failure in a college population) to irrelevant (capital murder) for the samples being studied. Incentives refer to the external motivation given to improve simulators' performance and can be positive (extra credit and monetary reward) or negative (extra time and effort). Finally, coaching refers to whether the participant receives any information on detection strategies that are designed to identify feigners. Using a large undergraduate sample in a factorial design, results indicate that a scenario familiar to the participants generally improved the believability of their responses. Coaching also improved the ability to feign convincingly, while incentive type was not associated with any change in scores. The implications of these findings for future research designs and the connection to practice are discussed.

Description: Several risk factors have been identified for adolescent sex offenders and non-sex offenders. Such risk factors include physical and/or sexual abuse, and exposure to community and/or domestic violence. Additionally, the presence of disinhibitive factors, such as substance use and exposure to violent or pornographic media are also commonly reported in the backgrounds of both sex and non-sex offenders. Similarly, adolescent offenders have reported traumatic reactions to environmental factors such as abuse and violence. Similarities in exposure to the risk and disinhibitive factors described above between adolescent sex and non-sex offenders do not provide an explanation for why some adolescents commit sex offenses, whereas other adolescent offenders do not. This study investigated the discriminative ability of traumatic reactions as a risk factor between male adolescent sex and non-sex offenders. The inclusion of traumatic reactions increased the accuracy of risk factors distinguishing between sex and non-sex offenders. Thus, not only the presence of risk factors, but also the adolescent's reaction to the risk factors, are important predictors of whether he will commit a sexual offense.