Image analysis of gunshot residue on entry wounds. I--The technique and preliminary study.

An automated image analysis (IA) technique has been developed to obtain a measure of the amount (i.e. number and area) of gunshot residue (GSR) particles within and around a gunshot wound. Sample preparation and IA procedures were standardised to improve the reproducibility of the IA measurements of GSR. Measurements of GSR from test firings into goat hide were enhanced by staining the barium and lead components present on the skin sections with Alizarin Red S. The amount of GSR detected on the stained skin sections was compared with backscatter electron micrographs of the same sections. The differences were deemed to be insignificant when the variability in the repeated test firings were taken into consideration. Preliminary results indicated that the decreasing relationship between firing range and the amount of GSR deposited was non-linear, and that for firing ranges of up to 20 cm the amount of GSR deposited from repeated shots fired from the same distance was highly variable.     

Differences in perceived seriousness of overt and covert road traffic offenses

Attitudes towards the perceived seriousness of road traffic offenses were studied as a function of the age and sex of drivers. Ratings of seriousness of 31 verbalized offenses were analyzed using detection theory parameters to study sensitivity and bias effects in the discrimination of “overt” and “covert” offenses. Overt offenses were defined as those which are immediately obvious to a casual observer, such as jumping red traffic lights. Covert offenses are those not so easily observable, such as driving a defective vehicle. The latter are inherently more hazardous, because they do not allow other road users to adopt appropriate margins of safety. The results indicated that young male drivers were relatively insensitive in discriminating between overt and covert offenses compared with other subgroups of drivers tested. Instructions which directed drivers to judge the offenses from the standpoints of personal responsibility, or involvement in, or the social consequences of, any accidental outcome, increased sensitivity relative to no such instructions being given. Analysis of the rating data itself showed that, overall, overtly offensive driving was considered less serious than covertly offensive driving. This was particularly the case for male and younger drivers. Possible implications of the results for legal sanctioning and other accident countermeasures are discussed.     

‘What is to be done?’ Anticipating the future and mobilizing prudence

Various social and political factors often block the emergence of good ideas — e.g., the presence of an overbearing leader, the loquaciousness of some actors and the shyness of others, conventional and doctrinal thinking, the political climate, etc. — and devices have been invented to overcome some of these obstacles in decisionmaking settings: the Delphi technique, idea writing, and the nominal group technique are all front-end operations designed to encourage the blossoming of possible solutions to problems. Devices for generating ideas have not been helpful in coping with the volumes of ideas produced, however, and this had led some theorists to give up on the human mind as a solver of problems. Following a summary of the factors impeding rationality in decisional settings, the advantages of Q methodology are presented, and a case study is described in which Q, in conjunction with front-end operations, has been used to assist groups in clarifying their own perspectives and in gaining access to collective wisdom (political prudence) for purposes of problem solving.

(Aristotle,Metaphysics)

Revised from a paper read at a meeting of the Policy Sciences Annual Institute, School of Law, Yale University, October 16–18, 1992, and at a meeting of the International Society for the Scientific Study of Subjectivity, University of Missouri, Columbia, October 7–9, 1993. We are grateful for the helpful comments from reviewers for this journal.     

Substance use and PTSD symptoms impact the likelihood of rape and revictimization in college women

The present study utilized a mixed retrospective and prospective design with an 8-month follow-up period to test a model of revictimization that included multiple childhood (i.e., child sexual, physical, and emotional abuse) and situational variables (i.e., substance use, sexual behavior) for predicting rape among 276 college women. It was of particular interest to determine whether traumatic responses (e.g., posttraumatic symptomatology or risky behavior) increased vulnerability for revictimization. During the 8-month follow-up period, 9% of participants were raped; 88% of assaults involved substance use by the victim. Posttraumatic stress disorder (PTSD) symptomatology predicted rape, substance use, and sexual behavior. Substance use, but not sexual behavior, mediated the relation between PTSD symptomatology and rape during the follow-up period. Sexual behavior indirectly impacted risk for rape via substance use. Results suggest that college women with PTSD symptomatology may be at greater risk for rape if they use substances to reduce distress.