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.
Digestibility
The measure of how much of the nutrient in a food the canine can extract and absorb.
Digital Device
Digital Evidence
Digital Image
digital image
An image that is represented by discrete numerical values organized in a two-dimensional array; when viewed on a monitor, projected image or printed on paper, it appears similar to a photograph. (SWGIT/SWGDE)
digital image processing
Any activity that transforms a digital image. (SWGDOC E03) (ANSI/ASB Std 035)
Digital Object
digital printing
A method of printing from a digital-based image directly to a variety of media.
Digital Sample (N)
A representative value of a signal at a chosen instant, derived from a portion of thatsignal. From the Vocabulary of Digital Transmission and Multiplexing, and PulseCode Modulation (PCM) Terms, ITU-T Recommendation G.701 (March, 1993)
digital signature
An electronic signature that includes an authentication scheme, such as through the use of public key encryption cryptography.
Digital Source
Digital Video Recorder, DVR
digitally captured signature (DCS)
The data produced from the capturing of the physical properties of the movement of a handwritten signature in the act, also known as Electronically Captured Signatures, Electronic Handwritten Signature, Biometric Signature. NOTE While a digitally captured signature is one kind of an electronic signature, it is not synonymous with digital signature, electronic signature, or eSignature.
Digitally Sample (V)
Obtain the values of a function for regularly or irregularly spaced distinct values fromits domain. From: ISO 2382-2-1976, Information technology Vocabulary Part2:Arithmetic and logic operations
Direct Attach
direct contact
Two sheets of paper, one on top of the other, with no intervening sheets. (SWGDOC E02)
direct examination
The questioning of a witness by the party that has called that witness to give evidence, in order to support the case that is being made.
direct thermal product
Substrate coated with a heat sensitive formulation for the purpose of creating an image when heat is applied from a thermal printhead. (ASTM F1623).
Direction Of Travel
The route in which a subject laid a trail as indicated by the canine.
Directional Angle
directional change
A modification in the progress of the written line; such changes can occur as gradual curves, abrupt angles, or curves and retracings.
Directional Control
The control a canine handler has over the canine during a search whereby the canine handler directs the canine into productive search areas by utilizing hand or voice cues.
directional skipping
A skip in a handwritten line that may occur after an abrupt change in the direction of the stroke.
Directional Tread Design
Directionality
directionality
The property of a trajectory or projectile impact that describes which way a projectile was moving.
Directory
Directory Listing
disagreement
A dissimilarity, or an accumulation of dissimilarities, that is deemed to be outside of expected variations in the appearance of impressions from the same source, resulting in overall nonconformity.
disagreement
A decision that dissimilarity, is deemed to be sufficiently outside of expected variations in the appearance of impressions from the same source that it results in overall nonconformity. Not to be confused with “dissimilarity.”
disagreement
A dissimilarity, or an accumulation of dissimilarities, that is deemed to be outside of expected variations in the appearance of impressions from the same source resulting in overall nonconformity.
Discipline-Related Deployment Record
A record of the deployment and/or utilization of a trained canine team, maintained separately from other records, i.e., training, assessments or certifications. A record documenting the deployment and/or utilization of the canine team, especially an account of an act or occurrence kept in writing or some other permanent form, i.e., electronic format, which is discoverable. (See record, deployment record or utilization record.)
Discoverable
Documentation that pertains to an investigation that can be requested and must be produced by the prosecution or the defense for trial purposes. For example, notes, records, certifications, photographs or digital media.
discovery
The exchange of materials by the parties in relation to a legal proceeding.
discriminability
The degree to which information in an impression can be used to distinguish it from impressions made by different sources. The discriminability of an impression is a combination of the quantity, spatial arrangement, clarity, and rarity of features observed.
Discriminate
Discriminating Power
Discrimination
The ability to recognize differences between two or more stimuli. Operational usage: The ability to recognize differences between two or more odors/scents.
Discriminative Stimulus
A stimulus that signals when a particular response produces specific consequences. For example, sitting in the presence of a particular odor/scent leads to a reward. The odor/scent in this case is the discriminative stimulus.
disguised writing
Deliberately altered in an attempt to hide normal writing habits. NOTE This is a type of distorted writing and determining the intent between the two remains with the trier of fact. (Modular Method)
Dislocations
Dispersion of Birefringe
Dispersion Staining
dissimilarity
An observation that two impressions have a general difference of appearance when comparing an individual feature or detail. Not to be confused with “disagreement.”
Dissimilarity
dissimilarity
An observation that two impressions have a general difference of appearance when comparing an individual feature or detail. Not to be confused with “disagreement.”
dissimilarity
An observation that two impressions have a general difference of appearance when comparing an individual feature or detail. Not to be confused with “disagreement.”
dissimilarity
A feature or characteristic in one item or group of items that is not in the same form in a comparable item or group of items.
Distal End
Distal Segment
The segment of a finger or thumb farthest from the palm.