Improved Area of Origin Estimation for Bloodstain Pattern Analysis Using 3D Scanning

An important component of crime scene reconstruction is bloodstain pattern analysis (BPA). Where BPA concerns impact patterns, estimating the area of origin is critical information for scene reconstruction. Traditionally, this is achieved by measuring individual bloodstains and performing trigonometric calculations; however, 3D scanning has been proposed as a viable alternative for overcoming logistical and practical concerns with the manual method. Therefore, this project aimed to establish whether the FARO Focus 3D scanner and FARO Zone 3D software can improve the accuracy of area of origin estimates relative to the manual method. We created a series of eight bloodstain impact patterns and performed paired analysis using the two methods to estimate areas of origin for each pattern. Our data suggested that FARO-derived estimates were generally more accurate than using the manual method. FARO-estimated heights of origin areas were generally closer to the true distance. Both methods underestimated the distance from the wall for most patterns originating 150mm or greater from the wall, but overestimated distances for patterns originating closer to the wall. The degree to which distances were underestimated increased significantly the further the blood source was from the wall and was greater for FARO-derived estimates. The results of this research contribute to the validation of these instruments for operational implementation for BPA and should be considered alongside the practical benefits of 3D scanning relative to manual methods. Further, 3D scanning can provide reliable BPA reconstruction documentation for technical review and court presentation.     

Economic Segregation and Unequal Policy Responsiveness

Political Behavior - As levels of residential economic segregation increase in the United States, politicians may have greater incentives to focus their attention on the demands of those living in...     

Loring Paul Jones: Life After Foster Care: Improving Outcomes for Former Foster Youth

Journal of Youth and Adolescence -     

NOAA's Resurrection of Program Budgeting: Déjà Vu All Over Again?

The National Oceanic and Atmospheric Administration instituted a Planning, Programming, Budgeting, and Execution System (PPBES) in 2002. As supplemented by matrix management, PPBES was appealing as an effort to rationalize the performance of an agency with an especially high degree of functional overlap among its component parts. Although PPBES has had some salutary effects, the agency's experience to date consistent with accounts of the difficulties that led to the abandonment of program budgeting by the civilian bureaucracy almost 40 years ago. As such, it speaks to the limits of performance assessment as a means of reallocating resources and responsibilities across organizational boundaries.     

Collusion in auctions for emission permits: An experimental analysis

Environmental markets have several institutional features that provide a new context for the use of auctions and that have not been studied previously. This paper reports on laboratory experiments testing three auction forms—uniform and discriminatory price sealed‐bid auctions and an ascending clock auction. We test the ability of subjects to tacitly or explicitly collude in order to maximize profits. Our main result is that the discriminatory and uniform price auctions produce greater revenues than the clock auction, both with and without explicit communication. The clock appears to facilitate successful collusion, both because of its sequential structure and because it allows bidders to focus on one dimension of cooperation (quantity) rather than two (price and quantity).© 2009 by the Association for Public Policy Analysis and Management.     

A New Measure of Policy Spending Priorities in the American States

In this paper, we develop and test a general measure of policyexpenditures in the American states. Our approach is to constructa spatial proximity model of yearly state program spending.The empirical analysis reveals that state spending patternsvary along a clear and readily-interpretable unidimensionalcontinuum which differentiates policies that provide particularizedbenefits to needy constituencies from policies that providebroader collective goods. Based upon standard evaluative criteria,the variable created from our model possesses some highly desirablecharacteristics. And, it compares favorably to other measuresof state policy activity. The net result is a yearly score foreach state which summarizes that state's spending across allmajor program areas. More generally, we believe that our variablecan be interpreted as valid and reliable representational measurementof state policy priorities. In this capacity, it could occupyan important position within models of state politics. Author's note: Many colleagues provided useful feedback on earlierversions of this paper. We particularly appreciate the excellentcomments and suggestions from Robert Erikson, Richard Fording,Kim Hill, David Lowery, Andrea McAtee, and George Rabinowitz.We would also like to thank Daniel Lewis and William Myers fortheir assistance with the data collection. The yearly statepolicy priority scores obtained from the unfolding analysis,along with the data used to create the scores, the SAS macroto carry out the unfolding procedure, and all other supplemental materialsare available on the authors’ web sites: http://polisci.msu.edu/jacobyand http://polisci.msu.edu/schneider. All these materials arealso available on the Political Analysis Web site.