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.
trainee [compare to examiner (friction ridge)]
An individual not yet authorized to conduct independent friction ridge examinations for the FSP; usually still in training, and has not yet successfully completed their FSP’s training program.
trainee [compare to examiner (friction ridge)]
An individual not yet authorized to conduct independent friction ridge examinations for the FSP; usually still in training, and has not yet successfully completed their FSP’s training program.
Trainer/Instructor
Any member of a specific discipline who is in a situation of instructing any part of the canine team using established methods and validated training guidelines.
Training
Goal oriented task designed to teach, correct, expand, improve, and maintain detection capabilities. (See reinforcement.)
Training
training
The formal, structured process through which a person progresses from their current level of knowledge and expertise to the level of competency required to conduct specific tasks in accordance with American National Standards.
Training Aid
Target odor/scent sources used for training.
Training Log Training Record
A record used to document the training of a canine, canine handler or canine team, maintained separately from other records, i.e., assessments, certifications or discipline-related deployment records. A record documenting the performance 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.
Training Program
A written description of activities to be performed for the purpose of establishing and maintaining competency and job-related knowledge, skills or abilities
trajectory
The arched path that a projectile follows in flight, typically modeled as a straight line for shortrange paths.
tram lines
An accumulation of ink found on both sides of an ink line, typically caused by squeegee effect from a gel ink pen.
Transaction
A group of records with information and biometric data concerning a particularindividual that is transmitted and / or stored as a complete unit.
Transaction Element
A record type / field / subfield / information item / value.
Transcode
Transcoding
Any transfer, compression, manipulation, re-formatting or re-storage of the originaldata. Transcoding can be lossless or lossy.
Transfer Impression
Transfer Stain
Transillumination
Imaging technique with light transmitted through an excised specimen.
Transition
A mutation that results in a change from one purine to the other purine (e.g., A-to-G) or one pyrimidine to the other pyrimidine (e.g., C-to-T).
transition
A mutation that results in a change from one purine to the other purine (e.g., A to G) or one pyrimidine to the other pyrimidine (e.g., C to T).
transmitted lighting
Illumination that passes through a document. (ANSI/ASB Std 035)
Transport Container
A container used to appropriately move training aids in compliance with storage and handling guidelines of the Federal, state, and/or local agencies' policy.
Transversion
A mutation that results in a change from a purine to pyrimidine or vice versa (e.g., A-to-T).
transversion
A mutation that results in a change from a purine to pyrimidine or vice versa (e.g., A to T).
trauma description
Reporting of the location(s), dimension(s), and other observed characteristics of the skeletal defect(s).
trauma interpretation
Explanation regarding the mechanism, timing, direction of impact(s), and/or minimum number of impacts associated with skeletal defect(s) using quantitative and/or qualitative evidence.
trauma mechanism
The external factors that produce a skeletal defect.
trauma timing
Occurrence of a skeletal injury relative to an individual's time of death (e.g., antemortem or perimortem).
Tread
Tread Block
Tread Depth
Tread Depth Gauge
Tread Design
Tread Wear Indicator
Tread Width
tremor
Shaky, irregular handwriting movements that are slowly executed or written by a person suffering from advanced age, nervousness, drug/alcohol influence, or physical/mental infirmities. These features can also be characteristic of unnaturally slow pen movements due to conscious attention to letterforms in deliberate drawings, rather than spontaneous writings.
tri-allelic pattern
The detection of three alleles in one individual at a particular STR locus.
Tri-linear Array
Trichonodosis
Trichoptilosis
Trichorrhexis Invaginata
Trichorrhexis Nodosa
Trichoschisis
Trigger Pull
The amount of force which must be applied to the trigger of a firearm to cause sear release. The direction of the applied force is approximately parallel to the bore axis.b
Trigger Pull
The amount of force which must be applied to the trigger of a firearm to cause sear release.
Triglyceride
Triple Base
Triple-Base
trough
The lighter or non-inked furrow between the tram lines typically seen in gel pen writing.
Turn
A conversation is a sequence of conversational turns. A turn is when an individualspeaks for a continuous period of time. Individual turns from different people mayoverlap when they speak simultaneously. However, typically a turn is referred to in aquestion / response environment.