Elemental analysis of glass by laser ablation inductively coupled plasma optical emission spectrometry (LA-ICP-OES)

The elemental analysis of glass evidence has been established as a powerful discrimination tool for forensic analysts. Laser ablation inductively coupled plasma optical emission spectrometry (LA-ICP-OES) has been compared to laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and energy dispersive micro X-ray fluorescence spectroscopy (μXRF/EDS) as competing instrumentation for the elemental analysis of glass. The development of a method for the forensic analysis of glass coupling laser ablation to ICP-OES is presented for the first time. LA-ICP-OES has demonstrated comparable analytical performance to LA-ICP-MS based on the use of the element menu, Al (Al I 396.15 nm), Ba (Ba II 455.40 nm), Ca (Ca II 315.88 nm), Fe (Fe II 238.20 nm), Li (Li I 670.78 nm), Mg (Mg I 285.21 nm), Sr (Sr II 407.77 nm), Ti (Ti II 368.51 nm), and Zr (Zr II 343.82 nm). The relevant figures of merit, such as precision, accuracy and sensitivity, are presented and compared to LA-ICP-MS. A set of 41 glass samples was used to assess the discrimination power of the LA-ICP-OES method in comparison to other elemental analysis techniques. This sample set consisted of several vehicle glass samples that originated from the same source (inside and outside windshield panes) and several glass samples that originated from different vehicles. Different match criteria were used and compared to determine the potential for Type I and Type II errors. It was determined that broader match criteria is more applicable to the forensic comparison of glass analysis because it can reduce the affect that micro-heterogeneity inherent in the glass fragments and a less than ideal sampling strategy can have on the interpretation of the results. Based on the test set reported here, a plus or minus four standard deviation (± 4s) match criterion yielded the lowest possibility of Type I and Type II errors. The developed LA-ICP-OES method has been shown to perform similarly to LA-ICP-MS in the discrimination among different sources of glass while offering the advantages of a lower cost of acquisition and operation of analytical instrumentation making ICP-OES a possible alternative elemental analysis method for the forensic laboratory.     

THE DOG THAT DIDN'T BARK: HOW PUBLIC MANAGERS HANDLE ENVIRONMENTAL SHOCKS

Do negative budgetary shocks reduce performance in public organizations? If so, by how much and in terms of which criteria? Are public managers able to make internal management choices to limit or eliminate the effects of such shocks? These questions are investigated in a set of hundreds of organizations over an 8‐year period. For the most part, budgetary shocks of 10 per cent or more have only limited or no negative impacts on performance in the short term. The most salient policy objective and production for more disadvantaged clientele are especially insulated from shocks. Decisions about internal resource allocation and personnel management can be shown to protect core production while sacrificing more peripheral activities and capital investment. Questions that remain to be investigated include whether short‐term protection comes at the expense of some longer‐term losses, and—ironically—whether effective management under such circumstances weakens over time the political case for adequate budgets.     

A COMPARISON OF TWO PROSECUTION POLICIES IN CASES OF INTIMATE PARTNER VIOLENCE: MANDATORY CASE FILING VERSUS FOLLOWING THE VICTIM'S LEAD*

Research Summary This study capitalized on differences in domestic violence prosecution policies between two boroughs of New York City. In Brooklyn, arrest cases generally are filed, but in the Bronx, cases typically are not filed when the victim does not want to proceed. We sampled 272 intimate partner cases declined by the Bronx prosecutor and 211 similar cases filed by the Brooklyn prosecutor. The Brooklyn policy is more costly, and most cases ultimately were dismissed. After 6 months, rearrest rates did not differ significantly between the two boroughs, although victims offered qualified support for the universal filing policy. Policy Implications Prosecutors face conflicting pressures when victims do not support prosecution. Victim empowerment and resource conservation favor declining such cases, but sending a message of zero tolerance favors filing. Our results support an intermediate policy of filing most cases but dropping them sooner to give victims a voice while avoiding heavy investments in cases headed for dismissal.