Analytical methods
Pyrolsis-GC
Microscopic technique that can be used to measure birefringence in fibers.
Polarized light microscopy (PLM)
The tool used to cut very thin slices for microscopic examination.
Microtome
Most common analytical technique used to identify ignitable liquid residues
GC/MS
Name a fiber with very low evidentiary value
something very common - ex. demin, white cotton
State the Locard Exchange Principle
Every contact leaves a trace
Separate ionized molecules based on mobility in a carrier gas
Ion mobility spectrometry (IMS)
What is the source in an SEM? (i.e., replaces light in traditional optical microscopy)
Electron beam
Sampling technique where the analyte in the gas phase distributes between the headspace and a polymer-coated fiber
Solid phase micro extraction (SPME)
In order to prevent the loss of VOCs, fire debris should be collected and stored in _________.
Airtight cans
Two main classifications for a fiber
Man-made and natural
Asking questions based of a expert witness' CV is an example of _______
voir dire
Spectroscopic methods that uses a beam of electrons to remove the inner shell of electrons from the atom
X-ray spectroscopy
Instrument that utilizes a microscope with different wavelengths of electromagnetic radiation to give a numerical value to color
Microspectrophotometer
Use of spiral or grid search pattern is an example of ____.
Systematic searching
Horizontal layer of soil differing from adjacent layers
Soil horizon
Term for a material that has the same optical properties in all directions
Isotropy
The concept of determining the sole source of an item
Individualization
Name two methods of elemental analysis for glass
ICP-MS, SEM-EDS, XRF
The measure of an objective's ability to gather light and resolve fine detail
Numerical aperture
If you have 30 packages of drugs you should sample, how many should you sample to get a representative sample?
Sample 10 at random
Ignitable liquid residues are more often __________ than IDENTIFIED
classified
Term for a single material with multiple refractive indices
Birefringence
Rule 702 is relating to _________________.
The admissibility of expert testimony
Two mechanisms of sample introduction for ICP-MS
Liquid injection (dissolve sample into liquid / acid digestion); laser ablation
Primary detector used in SEM-EDS
Secondary electron detector
The update of a gas or liquid INTO a substrate
Absorption
Control sample collected to demonstrate variability across the area of interest
Delineating samples
Hardness; solvent solubility; fragmentation pattern; isotropy
Name a colormetric test for cannabis.
Duquenois-Levine
KN reagent
Fast blue BB