The genetic and environmental overlap between aggressive and non-aggressive antisocial behavior in children and adolescents using the self-report delinquency interview (SR-DI)

Purpose

This study investigated genetic and environmental commonalities and differences between aggressive and non-aggressive antisocial behavior (ASB) in male and female child and adolescent twins, based on a newly developed self-report questionnaire with good reliability and external validity -- the Self-Report Delinquency Interview (SR-DI).

Methods

Subjects were 780 pairs of twins assessed through laboratory interviews at three time points in a longitudinal study, during which the twins were: (1) ages 9-10 years; (2) age 11-13 years, and (3) age 16-18 years.

Results

Sex differences were repeatedly observed for mean levels of ASB. In addition, diverse change patterns of genetic and environmental emerged, as a function of sex and form of ASB, during the development from childhood to adolescence. Although there was some overlap in etiologies of aggressive and non-aggressive ASB, predominantly in shared environmental factors, their genetic overlap was moderate and the non-shared environmental overlap was low.

Conclusions

Taken together, these results reinforced the importance of differentiating forms of ASB and further investigating sex differences in future research. These results should be considered in future comparisons between youth self-report and parental or teacher report of child and adolescent behavior, and may help elucidate commonalities and differences among informants.     

Book reviews

Slums of Hope: shanty towns of the Third World. Peter Lloyd, Harmondsworth, England: Penguin. 1979. 246 pp. £1.25 pb.

Agrarian Revolution: social movements and export agriculture in the underdeveloped world. Jeffery M Paige, London: Collier Macmillan. 1978. 435pp. £5.25 pb.

Population and Development: high and low fertility in poorer countries. Edited by Geoffrey Hawthorn, London: Frank Cass. 1978. 210pp. £11.00.

Theory of International Politics. Kenneth N Waltz, Reading: Addison‐Wesley. 1979.304 pp. £2.50.

The Commonwealth Office 1925–68. Joe Garner, London: Heinemann. 1978. 478 pp. £19.50.

Commodity Conflict: the political economy of international commodity negotiations. L N Rangarajan, London: Croom Helm. 1978. 390 pp. £12.95.

Global Fracture: the new international economic order. Michael Hudson, New York: Harper &; Row. 1977. 296 pp. £12.50

The Evolution of the International Economic Order. W Arthur Lewis, Princeton University Press. 1978. 81 pp. £5.00

The Newly Industrialising Countries and the Adjustment Problem. Foreign and Commonwealth Office, London: FCO. 1979. 96 pp.

Nuclear Weapons and World Politics: alternatives for the future. David C Gombert et al, New York: McGraw Hill. 1977. 370 pp. £5.20 pb.

Poverty, Wealth of Mankind. Albert T Tévoèdjrè, Oxford: Pergamon. 1979. 200 pp. £10.00. £5.00 pb.

Hosts and Guests: an anthropology of tourism. Edited by Valene L Smith, Oxford: Blackwell. 1978. 254 pp. £8.00.

Taxation and Economic Development: twelve critical studies. Edited by J F J Toye, London: Frank Cass. 1978. 299pp. £11.50.

The OPEC Market to 1985. Farid Abolfathi et al. Lexington, Massachusetts: Lexington Books (distributed in the UK by Teakfield). 1977. 406 pp. £15.00.

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Land and Power in South America. Sven Lindqvist, Harmondsworth, England: Penguin. 1978. 333 pp. £2.25 pb.     

Police confirmation of use of force in Australia: ‘To be or not to be?’

Despite significant transgressions during encounters with Indigenous peoples and marginalised groups, all six state police organisations in Australia espouse the principle of minimum force and identify service and crime prevention as paramount in community interaction and intervention. This article offers some insight and perspective of police talk and thinking about the potential use or avoidance of force. The four Victoria Police focus groups, when confronted by the specific police use of force scenario, speak of the adrenalin rush and the need to achieve results, if reasonable and necessary by force, but also of the desire to control the situation and follow proper police procedures. Officers support ‘Safety First’ principles that advocate a cautionary and suspicious approach to the scenario combined with rational and methodical tactics rather than emotional responses. The reflective talk of individual officers about the hypothetical situation parallels actual behaviour when police collectively and visibly confront public disorder. Control and containment of the situation—whether the scenario or a major crowd disturbance—are paramount while time, in the form of acting slowly and adopting a low-key approach, can be seen as assets in achieving objectives. In both the scenario and police planning for collective action, a readiness to threaten force, rather than actually employ it, appears central to police thinking. Police justification of non-coercive tactics in certain situations can be revealing about their thinking processes in justifying force in other circumstances.

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Screening for cocaine metabolite fails to detect an intoxication

Testing for the presence of cocaine (COC) is common in postmortem and clinical laboratories. COC use may be detected by screening urine specimens for COC metabolite. In the forensic arena, screening positive results are confirmed by a more specific and sensitive technique, such as gas chromatography-mass spectrometry. This article reports the case of an individual who died of COC intoxication but whose immunoassay screen (EMIT) for COC metabolite was negative. Gas chromatography-mass spectrometry analysis of the urine detected benzoylecgonine (BE) at a concentration of 75 ng/mL and COC at 55 ng/mL. These concentrations explain the negative screening result since the cutoff concentration of the assay was 300 ng/mL for BE. The reported cross reactivity with COC was 25,000 ng/mL. However, heart blood concentrations of COC and BE were 18,330 and 8640 ng/mL, respectively. The results from this case provide evidence that an EMIT test alone may fail to detect COC use. Individuals utilizing results of drug screening by immunoassay must be aware of the limitations of this testing methodology.     

A real-time multiplex SNP melting assay to discriminate individuals

A method that quickly and inexpensively differentiates crime scene samples from multiple donors would expedite casework analysis by allowing the selection of probative items requiring comprehensive testing. This new method need not be perfectly definitive nor give a complete 13 locus short tandem repeat (STR) profile; it simply must be able to differentiate between most victim and suspect samples. We describe the development of multiplex, single nucleotide polymorphism (SNP), fluorescence resonance energy transfer-based real-time polymerase chain reaction (PCR) assays to fulfill this need. Dual probes, one fluorescently labeled and the other labeled with a quencher, are monitored during a melt analysis to reveal an increase in fluorescence, which allows the assessment of the two SNP alleles. Two alternate 6-plex assays (with and without gender determination) have been developed for the six-color RG6000 real-time instrument (Corbett Robotics, Inc.) and one seven SNP plus gender assay (performed as two 4-plex assays, one with gender the other without) have been developed for use in four/five color real-time instruments. This technique can discriminate between 95% and 99% of samples from different individuals. This assay is fast (approximately 2 h), much less expensive than STR analysis, and uses a real-time PCR instrument which is found in most forensic and molecular biology labs.