Friction ridge detail was enhanced on f ired and unfired 9 mm brass Luger ammunition casings using three techniques, two involving gun blue reagent at a concentration of 50% v/v. Fingermarks were deposited on 90 ammunition casings, and half were discharged using a Glock 19 semiautomatic pistol. Mark development was achieved using either superglue fuming followed by basic yellow 40 f luorescent ...

The evidential value of the finding "gun in the hand" has been rated differently in the course of time. While Casper (1857) considered it to be infallible proof of suicide, investigators in later years tended to see it more as a manipulation for the purpose of faking a suicide. In 71 cases of proven suicide by a shot in the head on which autopsies were performed by the Institute of Forensic Med...

We present a new compact electron gun based on the secondary emission through ionic bombardment principle. The driving parameters to develop such a gun are to obtain a quite small electron gun for an in-flight instrument performing Electron Beam Fluorescence measurements (EBF) on board of a reentry vehicle in the upper atmosphere. These measurements are useful to characterize the gas flow aroun...

Laser-induced breakdown spectroscopy (LIBS) has been used to determine whether the hands of a suspected gun user contain traces of gunshot residue. Samples are obtained by pressing adhesive tape against the skin of the suspect and analyzing the tape directly. When the suspect has fired multiple shots, or if the gun has not been cleaned, the gunshot residue provides a spectral signature that is ...

Last year a second-generation SSRL-type thermionic cathode rf gun was installed in the Advanced Photon Source (APS) linac. This gun (referred to as “gun2”) has been successfully commissioned and now serves as the main injector for the APS linac, essentially replacing the Koontz-type DC gun. To help ensure injector availability, particularly with the advent of top-up mode operation at the APS, a...

We investigate the relationships between gun ownership and murders, reported rapes, and robberies. We proxy gun ownership by the number of subscriptions to the gun magazine Handguns Magazine and accommodate the count nature of our data by analyzing them with a multivariate Poisson-lognormal model. For most of our analyses, we find that the correlation between today’s number of guns and future c...

BACKGROUND Among developed nations, the United States has the highest rate of civilian gun ownership, and the highest homicide rate. We examine whether the United States is merely an exception, or if a relationship between gun availability and homicide exists across all developed nations. METHODS Homicide rates for the early 1990s come from 26 of 27 of the highly industrialized or high-income...

ment in parent supervision. Other postmarketing surveillance requirements include the monitoring ofthe durability of the product and determining whether the countermeasure has been applied as intended (for example bicycle helmet fit).5 What's needed is a systematic approach to injury countermeasure postmarketing surveillance. Only then will the full value of the countermeasure for the world com...

A new finite element gun code is under development. In an effort to improve the gun code model, a concept[1] has been proposed recently that treats fields in a typical way, but includes a unique, formal approach to both particle tracking and source allocation. Being a new approach, there are concerns about the speed, accuracy, and appropriateness of this proposal for the electrostatic, steady-s...

Four assumptions frequently arise in the aftermath of mass shootings in the United States: (1) that mental illness causes gun violence, (2) that psychiatric diagnosis can predict gun crime, (3) that shootings represent the deranged acts of mentally ill loners, and (4) that gun control "won't prevent" another Newtown (Connecticut school mass shooting). Each of these statements is certainly true ...