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Glass Addenda, Trace Evidence Quality Assurance Guidelines (Forensic Science Communications, January 2000)


January 2000 - Volume 2 - Number 1

Trace Evidence Quality Assurance Guidelines (January 1999 Revision)

Glass Addendum

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

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,, and 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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