Trace Evidence
This man is considered the Father of Trace Evidence, and famously stated "Every Contact Leaves a Trace."
Who is EDMOND LOCARD?
The three primary layers of duct tape.
What are the BACKING, REINFORCEMENT, and ADHESIVE layers?
A coating that dries solely by solvent evaporation.
What is a LACQUER?
This organization was founded in the wake of the 2009 NAS Report, and their primary responsibility is developing standard methods and guidelines for implementation in crime laboratories.
What is OSAC?
The most compelling level of association possible between two objects.
What is a PHYSICAL FIT?
This term describes an object with a uniform refractive index.
What is ISOTROPIC?
The inner strength of the adhesive, which influences heat resistance, holding power, and shear resistance.
What is COHESION?
A chemical component that indicates that a given paint sample is OEM, rather than a refinish.
What is MELAMINE?
This type of report may be used to document the results of gunshot residue analysis.
What is an IDENTIFICATION report?
Technique that identifies organic components of a material, but can also display indications of some inorganic additives.
What is FTIR-ATR?
This recovery technique is not recommended for the collection of paint evidence.
What is TAPING?
What is a PLAIN WEAVE?
The two primary components of paint that must be identified to fulfill the complete ASTM analytical scheme.
What are the BINDER and PIGMENT?
This type of report may be used to document the results of a physical fit analysis.
What is a COMPARISON report?
An inorganic, bulk analysis technique that uses photons to excite the atoms within a sample.
What is XRF?
This occurs when a piece of evidence is transferred to a person, who then passes the evidence along passively to another person.
What is SECONDARY TRANSFER?
A common component of electrical tape backings.
What is POLYVINYL CHLORIDE (PVC)?
White pigment commonly used in architectural and automotive paints.
What is TITANIUM DIOXIDE (TiO2)?
This type of report may be used to document the results of an ink analysis.
What is a CLASSIFICATION report?
This microchemical test can be used to differentiate between a lacquer and an enamel.
What is ACETONE SOLUBILITY?
The seven primary factors that influence persistence of trace evidence.
What are TIME, WEATHER, ACTIVITY, SIZE, SUBSTRATE, FORCE OF CONTACT, and LOCATION
The typical complete analytical scheme for tape analysis includes these four instrumental techniques, in order of use.
What are VISUAL/MICROSCOPIC EXAMINATION, FTIR-ATR, XRF or SEM-EDS, and Py-GC/MS?
The nonvolatile vehicle portion of a paint system contains these three components.
What are BINDERS, PIGMENTS, and ADDITIVES?
The conclusion or interpretation scale used in comparison reports includes these seven options for analysts to describe their results.
What are PHYSICAL FIT, ASSOCIATION WITH HIGHLY DISCRIMINATING CHARACTERISTICS, ASSOCIATION WITH DISCRIMINATING CHARACTERISTICS, ASSOCIATION WITH LIMITATIONS, INCONCLUSIVE, EXCLUSION WITH LIMITATIONS, and EXCLUSION.
An instrumental technique that is useful for color determination and comparison for very small paint samples.
What is MICROSPECTROPHOTOMETRY (MSP)?