The history of research into psychophysiological measurements as an aid to detecting lying, widely known as the ‘lie detector’ or polygraph, is the focus of this review. The physiological measurements used are detailed and the debates that exist in regards to its role in the investigative process are introduced. Attention is given to the main polygraph testing methods, namely the Comparative Question Test and the Concealed Information Test. Discussion of these two central methods, their uses and problems forms the basis of the review. Recommendations for future research are made specifically in regards to improving current polygraph technology and exploring the role of the polygraph in combination with other deception detection techniques.

Background: Sexting is an increasingly common phenomenon among adolescents and young adults. Some studies have investigated the role of personality traits in different sexting behaviors within mainstream personality taxonomies like Big Five and HEXACO. However, very few studies have investigated the role of maladaptive personality factors in sexting. Therefore, the present study investigated the relationship between Dark Triad Personality Traits and experimental (i.e., sharing own sexts), risky (i.e., sexting under substance use and with strangers), and aggravated sexting (i.e., non-consensual sexting and sexting under pressure) across 11 countries. Methods: An online survey was completed by 6093 participants (Mage = 20.35; SDage = 3.63) from 11 different countries which covered four continents (Europe, Asia, Africa, and America). Participants completed the Sexting Behaviors Questionnaire and the 12-item Dark Triad Dirty Dozen scale. Results: Hierarchical regression analyses showed that sharing own sexts was positively predicted by Machiavellianism and Narcissism. Both risky and aggravated sexting were positively predicted by Machiavellianism and Psychopathy. Conclusions: The present study provided empirical evidence that different sexting behaviors were predicted by Dark Triad Personality Traits, showing a relevant role of Machiavellianism in all kinds of investigated sexting behaviors. Research, clinical, and education implications for prevention programs are discussed.

Twenty cases, 14 infanticides and 6 neonaticides committed between 1989 and 2020 by biological mothers were analysed using Smallest Space Analysis for the presence of themes. Three themes associated with offender motivation were identified: Desperation, Disturbance and Rejection. Desperation theme included variables suggesting the mother committed the crime as a result of distress or perceived necessity. Disturbance suggested the motivation behind the offence to be as a result of the mother's caregiving role being disturbed; and the Rejection theme explained complete maternal rejection of the infant or new‐born as the motivation behind the crime. Alongside the themes, three core variables were identified to be common for the crime regardless of motivation: the crime being committed at Home, the victim Female, and the crime being Denied by the mother. The implications of the findings are discussed including the potential for an investigative support tool and developing understandings of neonaticide and infanticide as separate crimes.

Research has indicated that life‐course persistent offenders typically vary their offending style, following a criminal career progression from co‐ to solo‐offending. Few studies have investigated the offenders who contemporaneously mix their style of offending. A sample of 1,047 male adolescent offenders from the Pathways to Desistance study was investigated over a 7‐year period. Participants were identified as solo, co or contemporaneous mixed style (CMS) offenders for each wave of data and one‐way between groups analysis of variance was conducted to examine variations between the different offending styles in terms of offending frequencies, exposure to violence, peer antisocial behaviour and influence, resistance to peer influence, impulse control and psychopathy. CMS offenders were found to consistently report significantly higher rates of offending and present significantly higher negative risk factors and lower protective risk factors than solo‐ and co‐offenders for the duration of the study. A multinomial logistic regression was used to investigate predictors of offending style with CMS as the reference category. Higher levels of exposure to violence and peer antisocial behaviour and lower levels of impulse control predicted membership of the CMS group for the first part of the study when compared with co‐offenders; and higher levels of exposure to violence and peer antisocial behaviour continued to predict CMS offending when compared to solo‐offenders until the end of the study.