OSAC Lexicon
The OSAC Lexicon is a compendium of forensic science terms and definitions. This terminology tool was created to help bring consistency and understanding to the way terms are used by the various forensic science. Use of the OSAC Lexicon does not replace the need to reference the original published source.
The terms and definitions in the OSAC Lexicon come from the published literature, including documentary standards and technical reports. It is continually updated with the latest work from OSAC units, as well as terms from newly published documentary standards and standards elevated to the OSAC Registry.
Gradually terms are evaluated and harmonized by the OSAC to a single term. This process results in an OSAC Preferred Term. An OSAC Preferred Term is a term, along with its definition, that has undergone review and evaluation by the FSSB Terminology Task Group and has been approved by the FSSB. The FSSB recommends that subcommittees use OSAC Preferred Terms when drafting standards.
The OSAC Lexicon should be the primary resource for terminology and used when drafting and editing forensic science standards and other OSAC work products.
Scent
Volatile chemicals emitted from a live human that are perceived by the canine through olfaction. 'Scent' has traditionally referred to canine detection of humans. 'Odor' has traditionally referred to canine detection of a substance. (See odor.)
Scent Article
An item that has been exposed to the target scent source that is used to put the canine on task.
Scent Association
When a canine learns to identify a trained scent with a specific reward.
Scent Cone
A funnel-shaped scent pathway, which extends down-wind from the target, becoming wider the farther away from the target. The canine is able to locate the target by moving upwind.
Scent Discrimination
Operational usage: A dog's olfactory ability to distinguish between various odors.
Scent Discrimination
The ability of the canine to use olfactory capabilities to differentiate one scent from another
Scent Dispersion
Environmental conditions/factors/influences affecting the movement of scent from a fixed scent source. Movement of the source creates a separate scent cone at the new location.
Scent Match
See matching-to-sample.
Scent Pad
A material used to collect target scent from a person, object, or location for subsequent presentation to the canine.
Scent Plume
Dispersion of scent in a given environment. (See scent cone/scent dispersion.)
Scent Recognition
Demonstration of the canine's olfactory ability to alert on a target scent(s).
Scent Recognition Assessment
A test of the canine's olfactory ability to alert to target scent(s) in a controlled environment.
Scent Trail
Scent pathway left by a person.
Scent/Odor Association
When a canine learns to identify a trained odor/scent with a specific reward.
Scent/Odor Picture
The combination of odors/scents that are present when a detector canine responds to a trained odor/scent.
Schallamach Pattern
Scheme Owner
Person or organization responsible for developing and maintaining a specific certification scheme. The certification scheme owner can be the certification body itself, a governmental authority, a trade association, a group of certification bodies or others.
Scientific Expert
A person who has special knowledge of a subject about which a court requests testimony
scientific identification
The process of systematically comparing antemortem and postmortem biological data to facilitate a personal identification.
scientific identification
The process of systematically comparing antemortem and postmortem biological data to facilitate a personal identification.
Scientific Method
The systematic pursuit of knowledge involving the recognition and definition of a problem; the collection of data through observation and experimentation; analysis of the data; the formulation, evaluation and testing of hypotheses; and, where possible, the selection of a final hypothesis.
Scope Of Attestation
range or characteristics of objects of conformity assessment (4.2) covered by attestation (7.3)
Scoring Function (Or Similarity Score)
The mathematical core of a comparison algorithm which takes two input topographies and generates one or more outputs that quantify the comparison based on geometric similarity. Scoring functions are either rank-score only, interpretable, or statistically validated.
screen printing
A method in which the image areas are on fine mesh screen through which ink can penetrate and the non-image areas are a stencil over the screen.
Scrim
Scrim Count
Search
Search
Search Intent
The level of interest, attitude, and enthusiasm the canine shows while searching.
Search Result Set
Seat Of Explosion
A craterlike indentation created at the point of origin of some explosions.
Seated Explosion
An explosion with a highly localized point of origin, such as a crater.
Second Handler Canine
See backup handler canine.
second-party conformity assessment activity
conformity assessment activity that is performed by a person or organization that has a user interest in the object of conformity assessment (4.2)
Note 1 to entry: The first-, second- and third-party descriptors used to characterize conformity assessment activities in relation to a given object are not to be confused with the legal identification of the relevant parties to a contract.
EXAMPLE:
Persons or organizations performing second-party conformity assessment activities include, for example, purchasers or users of products, or potential customers seeking to rely on a supplier's management system, or organizations representing those interests. Examples of organizations representing user interest include consumer advocacy organizations, regulators implementing legislation governing products and services for the protection of consumer and public interests, centralized government procurement organizations and private sector purchasing agents.
Note 2 to entry: If an activity is performed by an external body acting on behalf of and controlled by a person or organization with a user interest, the activity is still called a second-party conformity assessment activity (e.g. supply chain audits conducted by an external body on behalf of the purchaser).
Secondary Electron (SE) Imaging
Secondary Explosion
Any subsequent explosion resulting from an initial explosion.
Secondary Explosive
secondary indentation secondary impression
Fiber disturbance(s) not caused by the act of writing or other dynamic actions, rather caused by dynamic contact with the embossed side of an indentation(s) or other raised surface. (ANSI/ASB Std 044)
Section Height
Section Width
secular change
Change in phenotype (e.g., stature) in a population over time.
Segmented Tire Mold
selected ion monitoring (SIM)
operation of a mass spectrometer in which the abundances of ions of one or more specific m/z values are recorded rather than the entire mass spectrum
selected reaction monitoring (SRM)
data acquired from one or more specific product ions corresponding to m/z selected precursor ions recorded via two or more stages of mass spectrometry
Selectivity
Self Heating
Self-Ignition
Ignition resulting from self-heating, synonymous with spontaneous ignition.
Self-Ignition Temperature
The minimum temperature at which the self-heating properties of a material lead to ignition.
Selvage
SEM stub
specimen collection device with an adhesive surface used to collect materials for SEM/EDS analysis.