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Characterization of hydraulic conductivity (K) in aquifers is critical for evaluation, management, and remediation of groundwater resources. While estimates of K have been traditionally obtained using hydraulic tests over discrete intervals in wells, geophysical measurements are emerging as an alternative way to estimate this parameter. Nuclear magnetic resonance (NMR) logging, a technology once largely applied to characterization of deep consolidated rock petroleum reservoirs, is beginning to see use in near-surface unconsolidated aquifers. Using a well-known rock physics relationship-the Schlumberger Doll Research (SDR) equation--K and porosity can be estimated from NMR water content and relaxation time. Calibration of SDR parameters is necessary for this transformation because NMR relaxation properties are, in part, a function of magnetic mineralization and pore space geometry, which are locally variable quantities. Here, we present a statistically based method for calibrating SDR parameters that establishes a range for the estimated parameters and simultaneously estimates the uncertainty of the resulting K values. We used co-located logging NMR and direct K measurements in an unconsolidated fluvial aquifer in Lawrence, Kansas, USA to demonstrate that K can be estimated using logging NMR to a similar level of uncertainty as with traditional direct hydraulic measurements in unconsolidated sediments under field conditions. Results of this study provide a benchmark for future calibrations of NMR to obtain K in unconsolidated sediments and suggest a method for evaluating uncertainty in both K and SDR parameter values.

Previous studies into the quality of investigating interviewing of suspects conducted in criminal investigations in England and Wales have almost exclusively focused on the skills and tactics employed by interviewing officers during interviews. However, interviewing officers are trained in an interviewing framework that includes the importance of evaluating interviews as a means of improving skills. In light of the scarcity of research concerning the evaluation task, this study examined perceptions of benefit fraud investigation personnel. A questionnaire was answered by 114 respondents including investigators, investigation managers, investigation trainers, and investigation inspectors. From their responses, it was evident that there was an understanding of the necessary skills required to conduct interviews. However, after comparing these responses with the actual interviewing practice of benefit fraud investigators, there was found to be a gap between these beliefs and practice. The findings suggest that although it is agreed what interviewing skills are required to conduct interviews, investigators and managers do not accurately reflect upon whether these skills are actually employed in interviews. This suggests that evaluation of interviews is being neglected and may well explain why research reveals interviewing performance to be often mediocre. Copyright © 2011 John Wiley & Sons, Ltd.

Purpose. The present study examines whether interviewing in a manner that is compatible with a recommended model of interviewing (called the ‘PEACE’ model) impacts on outcomes of the interviews examined in contrast to prior studies which have usually been concerned whether the conducted interviews were fair and not coercive or whether there had been positive effects of training upon subsequent interview performance. Methods. This study, examining in detail 142 actual suspect interviews, is set in the barely researched area of social security benefit fraud, reflecting current trends in Britain concerning increasing numbers of interviews with suspects undertaken by public sector organizations and the pluralization of policing. Results. It was found that good interviewing in each of the recommended stages that make up the PEACE model generally led to better interviews, indicating the importance that each stage contributes to overall interview quality. Further, the quality of interviews was compared against a range of interview outcomes and it was found that skilled PEACE interviewing was associated with the securing of full accounts, including confessions. Conclusion. Given the few examples of skilled interviewing found in the study it is argued that further training of investigators is necessary to improve both interviewing performance and organizational outcomes.

Law Enforcement Agencies gather intelligence in order to prevent criminal activity and pursue criminals. In the context of human intelligence collection, intelligence elicitation relies heavily upon the deployment of appropriate evidence-based interviewing techniques (a topic rarely covered in the extant research literature). The present research gained unprecedented access to audio recorded telephone interactions (N = 105) between Source Handlers and Covert Human Intelligence Sources (CHIS) from England and Wales. The research explored the mean use of various question types per interaction and across all questions asked in the sample, as well as comparing the intelligence yield for appropriate and inappropriate questions. Source Handlers were found to utilise vastly more appropriate questions than inappropriate questions, though they rarely used open-ended questions. Across the total interactions, appropriate questions (by far) were associated with the gathering of much of the total intelligence yield. Implications for practice are discussed.