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.
not suitable for comparison
A judgment that a more detailed examination is not warranted. The examiner determined there were minimal or no confirmable or discernable features present. This determination applies when there is insufficient detail to conduct any comparison.
Notches
Novice Dog
See green dog.
nuclear DNA
The DNA contained within a nucleus of eukaryotic organisms comprising the majority of the genome.
Nuclear Mitochondrial Dna Segment (Numt)
A transposition of any type of cytoplasmic mitochondrial DNA into the nuclear genome of a eukaryotic organism.
Nuclear mitochondrial DNA segments NUMTs
Regions of mitochondrial DNA inserted into the nuclear genome over evolutionary time.
Nucleases
Enzymes that degrade (break down) nucleic acids.
Nuggets
null allele
The inability to detect an individual’s allele during DNA testing. Possible causes include: a variant (mutation) in the template DNA that prevents a PCR primer from binding properly and thus preventing the generation of a DNA product or the loss of the DNA sequence for the allele from the genome due to a deletion. The detection of a single allele may suggest the individual is homozygous when the individual is actually heterozygous at that locus, but the second allele is undetected with the method used.
Nutrition Maintenance
Nutrients provided to keep body condition at a healthy level in an adult canine without providing additional nutrients for growth, reproduction or weight gain, will vary with level of activity.
Obedience Training
The training of an animal, especially a canine, to obey certain commands.
object of conformity assessment/object
entity to which specified requirements (5.1) apply
EXAMPLE:
Product, process, service, system, installation, project, data, design, material, claim, person, body or organization, or any combination thereof.
Note 1 to entry: The term “body” is used in this document to refer to conformity assessment bodies (4.6) and accreditation bodies (4.7). The term “organization” is used in its general meaning and may include bodies according to the context. The more specific ISO/IEC Guide 2 definition of an organization as a body based on membership is not applicable to the field of conformity assessment (4.1).
objection
A lawyer's protest about the legal propriety of a question, response, or other evidence made with the purpose of obtaining a ruling from the trial judge about whether the question can be asked, the answer can be given, or the evidence can be admitted.
Objective-Oriented Training
Training to enhance a canine team's proficiency using specific goals established prior to the initiation of the training.
objectives
Oblique Lighting
Observation
OSAC Preferred
DEPRECATED: finding
result of analysis (3.2) of items (3.33) or of the scene (3.58)
Note 1 to entry: An observation can be the result of human perception-based analysis, instrumental analysis, or a combination of the two.
Numbers in the parenthesis refers to additional terms in the standard.
observation
Recognizing and noting an occurrence.
observation (data) (modified)
results of analysis of items
NOTE An observation can result from human-perception-based analysis, instrumental analysis, or a combination of the two.
observational drawing
A visuomotor task in which visual information (an object, a photograph, handwriting) has to be translated into marks on the paper so that the copy ideally matches the original. Also known as sketching.
observed data
Any information seen within an impression that an examiner relies upon to reach a decision, conclusion, or opinion. This not only includes minutiae, but attributes such as clarity, scars, creases, edge shapes, pore structure, and other friction ridge features.
observed data
Any information seen within an impression that an examiner may rely upon to reach a decision, conclusion, or opinion. This not only includes minutiae, but attributes such as clarity, scars, creases, edge shapes, pore structure, and other friction ridge features.
observed data
Any information seen within an impression that an examiner relies upon to reach a decision, conclusion, or opinion. This not only includes minutiae, but attributes such as clarity, scars, creases, edge shapes, pore structure, and other friction ridge features.
observed data
Any information seen within an impression that an examiner relies upon to reach a decision, conclusion, or opinion. This not only includes minutiae, but attributes such as clarity, scars, creases, edge shapes, pore structure, and other friction ridge features.
observed data
Any information seen within an impression that an examiner relies upon to reach a decision, conclusion, or opinion. This not only includes minutiae, but attributes such as clarity, scars, creases, edge shapes, pore structure, and other friction ridge features.
observed data
Any information seen within an impression that an examiner may rely upon to reach a decision, conclusion, or opinion. This not only includes minutiae, but attributes such as clarity, scars, creases, edge shapes, pore structure, and other friction ridge features.
observed data
Any information seen within an impression that an examiner relies upon to reach a decision, conclusion, or opinion. This not only includes minutiae, but attributes such as clarity, scars, creases, edge shapes, pore structure, and other friction ridge features.
Occlusion
Odontology
Forensic dentistry a specialized discipline in dentistry to identify individuals basedupon characteristics of their dentition and oral region.
Odor
Volatile chemicals emitted from a substance that are able to be perceived by olfaction. 'Odor' has traditionally referred to canine detection of a substance. 'Scent' has traditionally referred to canine detection of humans. (See scent.)
Odor Dispersion
Environmental conditions/factors/influences affecting the movement of odor. (See odor plume.)
Odor Plume
Dispersion of odor in a given environment. (See odor dispersion.)
Odor Recognition
Demonstration of the canine's olfactory ability to alert to a target odor(s).
Odor Recognition Assessment
A test of the canine's olfactory ability to alert to target odor(s) in a controlled environment.
Odor Signature
The chemical profile of an odor produced by a substance.
Odor/Scent Pool
Area of concentrated target odor/scent.
Odorant
Molecules that are properties of the external world objectively defined in terms of their physical and chemical characteristics and capable of being transposed by particular nervous systems into odors.
off-foot
The lack of desired and optimum uniformity of contact between the typeface the bill and the substrate. Also known as "off its feet". (SWGDOC E04)
off-ladder allele (OL)
An STR allele that is of a different length than is found in the allelic ladder for a particular locus.
Off-Lead
Any work or interactions with the canine where the canine is not attached to a lead.
off-scale STR data
Data produced when the emitted fluorescence from the PCR products being measured saturates the detector; may result in flat-topped peaks in an electropherogram for STR alleles and pull-up peaks in one or more color channels corresponding to the off-scale peak.
Offset
offset
Press design in which an image is transferred from a plate to a rubber blanket that moves the image to the press sheet; offset principle allows plates to be right reading and generally gives a better- quality image than do direct transfers.
offset lithography
A rotary planographic process, which yields a flat printed image, producing both the image and non- image areas of the plate chemically on one plane, creating the flat printing result. This process utilizes viscous inks based on a mixture of oils and/or resins, containing pigments and additives.
offsite technical training
Information, knowledge, or training gained by interaction with or demonstration by pertinent manufacturers, businesses, and laboratories (e.g., paper mill, copier manufacturer) by going to a particular location away from the usual training or work site.
Ohm
The SI unit of electrical impedance or, in the direct current case, electrical resistance.
Olfaction Olfactory
Of, relating to, or connected with the sense of smell.
omega (ω)
any vibration direction in the plane of the a axis for uniaxial crystals.
On-Lead
Any work or interactions with the canine where the canine is attached to a lead.
Ongoing Performance Checks
Procedures performed to verify that the technology or technical procedure is working as expected.