Detection of bullet residue in bone using proton-induced X-ray emission (PIXE) analysis

External beam proton-induced X-ray emission (PIXE) analysis has been used to verify the presence of lead in the finger bone of a murder victim. The deceased, who had been buried several years, was known to have suffered a bullet wound to his right hand several years before death. X-ray radiographs of the right second proximal phalanx revealed the possible presence of metal fragments below the surface of the bone. To verify the presence of lead in a nondestructive manner, the bone was scanned with a 1.5-MeV proton beam. PIXE analysis showed that lead was present only in the vicinity of the fragments previously detected in the radiographs. A study of gunshot residue in bone shows that the distribution of lead around the bullet hole is independent of the firing distance for distances greater than 0.6 m.     

Indian spies inside Pakistan: South Asian human intelligence across borders

This article examines India’s historical efforts to spy inside Pakistan from the mid-1960s to the early 1970s. It draws from memoirs of notable Indian spies who were jailed for espionage in Pakistan and spy ‘fiction’ written by former Indian intelligence and military officers who allege their writing is based on actual cases. The article highlights commonalities among Indian spies using the words of Indian officers to better understand human intelligence efforts inside Pakistan. It finds that Indian spies in these books have initially been Hindus or from multi-religious families, from the Indian-Pakistan border and have been poorly treated by the Indian government and its intelligence services.     

Getting Their Way: Bias and Deference to Trial Courts

How much do trial judges influence the law in the United States? I analyze a model of adjudication by a trial judge who engages in fact finding before deciding a case, but whose decision may be reversed. The model makes three broad points. First, it provides an informational rationale for ex post deference to biased trial judges that does not require an ex ante commitment by an appellate court to a standard of review. Second, it shows how procedural discretion can bring biased trial judges' rulings closer to appellate doctrine despite enabling trial judges to “get their way” more often. Third, de facto law as represented by trial judges' case‐by‐case adjudication will differ substantially from de jure law. As long as there are not too many extremist trial judges, de facto law will reflect the predispositions of trial judges, not legal doctrine.     

Using Bayesian Aldrich‐McKelvey Scaling to Study Citizens' Ideological Preferences and Perceptions

Aldrich‐McKelvey scaling is a powerful method that corrects for differential‐item functioning (DIF) in estimating the positions of political stimuli (e.g., parties and candidates) and survey respondents along a latent policy dimension from issue scale data. DIF arises when respondents interpret issue scales (e.g., the standard liberal‐conservative scale) differently and distort their placements of the stimuli and themselves. We develop a Bayesian implementation of the classical maximum likelihood Aldrich‐McKelvey scaling method that overcomes some important shortcomings in the classical procedure. We then apply this method to study citizens' ideological preferences and perceptions using data from the 2004–2012 American National Election Studies and the 2010 Cooperative Congressional Election Study. Our findings indicate that DIF biases self‐placements on the liberal‐conservative scale in a way that understates the extent of polarization in the contemporary American electorate and that citizens have remarkably accurate perceptions of the ideological positions of senators and Senate candidates.