Do bone elasticity and postmortem interval affect forensic fractographic analyses?

Forensic fractographic features of bone reliably establish crack propagation in perimortem injuries. We investigated if similar fracture surface features characterize postmortem fractures. Experimentally induced peri- and postmortem fractures were used to assess if fractographic features vary as bone elasticity decreases during the postmortem interval (PMI). Thirty-seven unembalmed, defleshed human femoral shafts from males and females aged 33–81 years were fractured at varying PMIs with a drop test frame using a three-point bending setup and recorded with a high-speed camera. Vital statistics, cause of death, PMI length, temperature, humidity, collagen percentage, water loss, fracture energy, and fractography scores were recorded for each sample. Results showed that fractographic features associated with perimortem fractures were expressed in PMIs up to 40,600 accumulated degree hours (ADH), or 60 warm weather days. Hackle was the most consistently expressed feature, occurring in all fractures regardless of ADH. The most variable characteristics were wake features (78.4%) and arrest ridges (70.3%). Collagen percentage did not correlate strongly with ADH (r = −0.04, p = 0.81); however, there was a strong significant correlation between ADH and water loss (r = 0.74, p < 0.001). Multinomial logistic regression showed no association between fractographic feature expression and ADH or collagen percentage. In conclusion, forensic fractographic features reliably determine initiation and directionality of crack propagation in experimentally induced PMIs up to 40,600 ADH, demonstrating the utility of this method into the recent postmortem interval. This expression of reliable fractographic features throughout the early PMI intimates these characteristics may not be useful standalone features for discerning peri- versus postmortem fractures.     

The study of legislative committees*

ABSTRACT

Proving that legislative committees really matter is not simple. The assembled papers aim to demonstrate fruitful paths to analysing when committees influence policy, what they can and should do, and how to detect their importance to the political process.     

Center for Biological Diversity v U. S. Forest Service: A New Type of Claim or Just Another Step in the Chain of Causation?1

Abstract

This article discusses what it means to “contribute” to waste disposal as that term is used in section 7002 of the Resource Conservation and Recovery Act. More specifically, the article examines whether the US Forest Service can violate section 7002 by not regulating hunting. Among the issues addressed are whether one can contribute to waste disposal passively, whether one can contribute to waste disposal without taking any action that addresses waste disposal and the extent to which the statutory term “contribute” is analogous to the common law concept of causation.     

Is cooperation cost reducing? An analysis of public–public partnerships and inter-municipal cooperation in Brazilian local government

ABSTRACT

In local government systems worldwide, financial pressures have obliged local authorities to focus on cost-efficient methods for providing local services, including inter-municipal agreements and public–public partnerships. However, in comparison with municipal mergers, privatisation and other approaches to the problem, the cost impact of the cooperative provision has not yet been thoroughly examined empirically. Moreover, available empirical research has largely concentrated on waste disposal in developed countries. The present paper seeks to contribute to the empirical literature on inter-municipal agreements and public–public partnerships by comparing their impact on costs with ‘stand-alone’ provision in a range of non-waste local services. In contrast to the bulk of existing studies, our analysis takes place in a developing country context by examining Brazilian local government over the period 2013/15. We found that – on the whole – cooperative provision is less expensive than the ‘stand-alone’ provision for the services studied. Our results can be explained by the size and composition of the population, together with the politics for cooperation.     

Toward More “Evidence‐Informed” Policy Making?

The quality of public decision making depends significantly on the quality of analysis and advice provided through public organizations. Champions of “evidence‐informed” policy making claim that rigorous evaluation practices can significantly improve attainment of cost‐effective outcomes. After decades of experience, performance information is more sophisticated, but evaluation practices and capabilities vary enormously. Public agencies gather and process vast amounts of information, but there has been little analysis of how this information is actually utilized for policy and program improvement. This article examines how government agencies use evidence about policy and program effectiveness, with attention to four themes: (1) the prospects for improving “evidence‐informed” policy making, (2) the diversity of practices concerning evidence utilization and evaluation across types of public agencies and policy arenas, (3) recent attempts to “institutionalize” evaluation as a core feature of policy development and budget approval, and (4) the relationships between public agencies and nongovernmental sources of expertise.