Discrimination between sediment and soil samples for forensic purposes using elemental data: an investigation of particle size effects

This paper reports the results of an investigation to quantify variations in elemental concentrations amongst different particle size fractions obtained from a suite of sediment samples collected from the River Avon, UK. Concentrations of 49 elements determined by inductively coupled plasma spectrometry (ICP-AES and ICP-MS) were compared using conventional and multivariate statistical methods in order to assess compositional differences between different size fractions and between different samples. The results showed significant differences between different size fractions and the bulk sediments, but indicated that all of the size fractions considered (<150, 63-150, 20-63 and <20microm) provided an adequate basis on which to identify associations and differences between samples. It was concluded that, while in certain specific circumstances it may be most appropriate to make forensic comparisons based on a very narrowly defined particle size range, for the majority of purposes the <150microm fraction provides the best compromise between sample size requirements and data resolution.     

Multi-technique comparison of source and primary transfer soil samples: an experimental investigation.

The comparison of soil samples is of long-standing and increasing interest in forensic science. Routine comparisons should involve the use of several techniques in combination. A wide range of analytical techniques can be used, choice being dependent on several factors including sample size and character, time constraints and cost limitations. In this paper results are presented for experiments carried out to test the effectiveness of four of the available analytical techniques (spectro-photometric colour determination, laser diffraction particle size analysis, stable isotope analysis and chemical element analysis) used to compare single source and primary transfer soil samples. Four soil types and five footwear types were used. All four techniques showed excellent precision and good resolving power between soil types. Only relatively small differences were obtained between source and transferred soil samples in terms of colour, stable carbon and nitrogen isotope ratios and elemental chemistry. Slight but significant differences were found in grain size, indicating that the primary transfer process is to some extent grain size selective.     

Forensic analysis of soil and sediment traces by scanning electron microscopy and energy-dispersive X-ray analysis: an experimental investigation

This paper reports the results of a series of experiments carried out to determine the precision of soil trace comparisons based on elemental peak height ratios determined by energy-dispersive X-ray analysis (EDXRA) in a variable pressure scanning electron microscope (VP-SEM). Experiments were conducted on 'bulk' soil aggregates, ground powders prepared from the <150 microm soil fractions and on smears of both the bulk soil and <150 microm material placed on cotton cloth. X-ray count data were obtained using area scans and spot analyses at different magnifications. The effects on elemental peak height ratios of varying the SEM chamber pressure, beam spot size, emission current and accelerating voltage were also examined. The peak height ratios for oxygen, silicon, aluminium, potassium, calcium and iron were found to show little variation as a function of chamber pressure, spot size and emission current over the ranges examined, but a strong dependency on accelerating voltage was observed. Within-sample variation in results, expressed by the percentage coefficient of variation, was found to be lowest for area scan analyses of the ground <150 microm fractions and greatest for the spot analyses of the bulk soil aggregates and the <150 microm fractions. We conclude that comparison of elemental peak height ratios determined by EDXRA can be a useful tool for rapid screening of soil samples, especially when combined with investigation of other attributes of the soil traces such as colour, fabric and the composition, shapes and surface textures of individual particles or aggregates within the soil traces. If sufficient material is available and can be readily separated without contamination or loss, higher resolution and more precise elemental data should be obtained by methods such as inductively coupled plasma atomic-emission spectrometry (ICP-AES) or mass-spectrometry (ICP-MS).     

Adaptive Programming Improves Outcomes in Drug Court: An Experimental Trial

Prior studies in Drug Courts reported improved outcomes when participants were matched to schedules of judicial status hearings based on their criminological risk level. The current experiment determined whether incremental efficacy could be gained by periodically adjusting the schedule of status hearings and clinical case-management sessions in response to participants' ensuing performance in the program. The adjustments were made pursuant to a priori criteria specified in an adaptive algorithm. Results confirmed that participants in the full adaptive condition (n = 62) were more than twice as likely as those assigned to baseline-matching only (n = 63) to be drug-abstinent during the first 18 weeks of the program; however, graduation rates and the average time to case resolution were not significantly different. The positive effects of the adaptive program appear to have stemmed from holding noncompliant participants more accountable for meeting their attendance obligations in the program. Directions for future research and practice implications are discussed.     

The EU,NATO and Europeanisation: The return of architectural debate

In international relations, ideas matter. Not only are ideas important, and rooted in a relationship with interests, but present ideas are shaped by the outcome of past ideational battles. It is the impact of conflict between the ideas of the early 1990s upon the present that concerns this article. The first section of this article suggests that ideas matter. The second then examines the interplay of those ideas of European security in the early 1990s. The third and fourth sections trace the inevitable move to NATO enlargement that arose as a consequence. And the conclusion will examine how this contemporary history has shaped the debates of today.     

Book reviews

Ennio Di Nolfo (ed.), Power in Europe?II. Great Britain, France, Germany and Italy and the Origins of the EEC, 1952-1957. (Berlin and New York: Walter de Gruyter, 1992), DM238.

Simon J. Nuttall, European Political Cooperation (Oxford: Clarendon Press, 1992), 343pp. £30, ISBN 0 19 827318 5.

Michael Smith and Stephen Woolcock, The United States and the European Community in a Transformed World (London: Pinter publishers for Royal Institute for International Affairs, 1993), 120 pp., £22.50 hb, £9.95 pb. ISBN 086187 0972/086187 0980.

Richard H. Ullman, Securing Europe (London: Adamantine Press, 1991), 175pp., £12.95. ISBN 0 7449 0036 0.

Cornelia Navari (ed.), The Condition of States: A Study in International Political Theory (Milton Keynes: Open University Press, 1991), 238pp.

Francine Friedman, (comp. and ed.) Yugoslavia: A Comprehensive English-Language Bibliography (Wilmington, Delaware: Scholarly Resources, 1993), xv + 547 pp., indices, US$ 120.

Richard Dean Burns (ed.), Encyclopedia of Arms Control and Disarmament (New York: Charles Scribner's Sons, 1993), three vols., 1692 pp. inch index, US$280, ISBN 0 684 19281 0.     

Leisure Experience, Prison Culture, or Victimization? Sex Offenders Report on Prison Gambling

Opportunities for gambling in mainstream North American society have increased greatly over the past two decades. Despite the popularity of legalized gambling and attention it is receiving among social science researchers and economists, gambling within jails and prisons has been overlooked. This study utilized a semistructured interviewing procedure (Smith, 1995) to gain information about prison gambling from 11 sexual offenders on parole—all had spent significant time incarcerated. Qualitative analyses of responses suggest that offenders may gamble in various forms and for a variety of reasons, including a means of alleviating boredom, providing excitement and risk, and an opportunity to socialize. Prison gambling appears to be a complex phenomenon. A substantial amount of prison gambling seems to be associated with certain psychosocial benefits, while for a minority of cases there may be severe violence and victimization.     

When is 100% inspection not enough? An analysis of three pickup truck front wheel assembly failures

The loss of a cotter pin in the front wheel assembly of cars and trucks has been a problem for several years. This is shown by the fact that the automobile manufacturers have been committed to a 100% inspection of the process for installing them on cars and trucks. In this paper, three accident cases are presented, along with a method by which the forensic engineer can determine if a cotter pin has ever been installed on the front wheel assembly. Testing was done to show what the spindle would look like if the cotter pin had been installed properly and forcibly removed. Photographs show both the accident and test spindle for comparison.