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January 2000 Volume 2 Number
1
Trace Evidence Quality
Assurance Guidelines
(January 1999 Revision)
Glass
Addendum
GA2.3.3.3
Successful completion of
the following undergraduate or graduate courses:
1. One year (or equivalent)
general and/or introductory chemistry with laboratory work;
2. Instrumental quantitative analysis with laboratory work
and statistical interpretation of data; and
3. Physics with laboratory work and topics mechanics
and optics.
If the following course is
not available at the graduate or undergraduate level, then completion
through structured course work is required:
4. Light Microscopy: Theory
and Practice with Basic PLM.
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Glass Addendum
GA2.4.1.2a
The training period will
be a minimum of 12 months, full time, for the inexperienced trainee
examiner. The allotted time includes the specifications under
sections 2.4.1.2, 2.4.1.3, and 2.4.1.4. These sections refer
to casework observation, supervised casework, proficiency test(s),
examinations, and moot court.
Suggested inclusion topics
for the time line follow:
Introduction to Glass
Technology
A. Definition of Glass
B. Physical Structure and Properties
C. Types of Glass and End Uses
D. Chemical Composition of Glass
E. History of Glass Manufacture
F. Production Methods and Processes for Glass Types
G. Strengthening of Glass
H. Transfer and Persistence and Survey Studies
Collection and Packaging
A. Glass Collection and Packaging
Techniques
B. Contamination Implications
Macroscopic Examinations
A. Fracture Examinations
B. Color
C. Size and Shape
D. Surface Finishes and Texture
E. Thickness
F. UV Fluorescence
Examination of Physical
Properties
A. Density
B. Thickness
C. Color
D. Other
Microscopic Examinations
A. Microscopic Recognition
of Glass
B. Classification by Optical Properties
C. Microscopic Fracture Characterization
D. Interferometry
E. Float Surfaces
Determination of Refractive
Index
A. Reannealing
B. Dispersion
Elemental Analysis
A. Scanning Electron Microscopy
(SEM) with
Energy Dispersive X-ray Spectrometry (EDS) and
Wavelength Dispersive X-Ray Spectrometry (WDS)
B. X-Ray Fluorescence Spectrometry (XRF)
C. Emission Spectroscopy (ES)
D. Atomic Absorption Spectrometry (AA)-Flame
and Graphite Furnace
E. Inductively Coupled Plasma-Atomic Emission
Spectrometry (ICP/AES)
F. Inductively Coupled Plasma-Mass Spectrometry (ICP-MS)
G. Neutron Activation Analysis (NAA)
Interpretation of Results
A. Accuracy and Precision
of Analytical Measurements
B. Discrimination Criteria
C. Classification
D. Databases
E. Report Writing and Testimony
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FORENSIC SCIENCE COMMUNICATIONS JANUARY 2000 VOLUME 2 NUMBER 1 |
