No coin nor oath required. For personal study only.
An analysis scheme is presented to differentiate between and compare glass fiber types using complementary techniques in light and electron (SEM-EDS) microscopy. Manufacturing techniques, products, optical properties and the elemental compositions of fiberglass, glass wools, rock wools, slag wools, and ceramic fibers will be discussed.
Frequent analysis of certain powdered drugs of abuse can lead to positive urine tests for those analyzing the drugs. While the levels of drugs and their metabolites in urine may not be high, the concentrations can be significant enough to give a positive result with routine screening and confirmation methods. Large sample amounts coupled with frequent analysis of powdered drugs increases the air-borne concentration and hence increases the amount available for inhalation. The levels found to be present are typically far below normal levels present in those arrested for abuse of drugs, however. Regardless, proper use of laboratory safety precautions (i.e., hoods) does not eliminate the ingestion of cocaine by drug criminalists.
๐ SIMILAR VOLUMES
The analysis of trace materials is an important aspect of a forensic investigation. A single fiber, a few drug crystals of a suspected narcotic, or a paint chip from a suspect's car may be pivotal evidence in a criminal case. The optical viewing capabilities, sensitivity and non-destructive nature o
The Seventy-eighth Semi-annual Seminar of the
The 70th Semi-annual Seminar of the California Association of Criminalists was held in Irvine, California, from 22-24 October 1987. Abstracts of the papers presented at that meeting are printed below.