the ability to identify a concept or problem, to organize information for decision making, to establish criteria for evaluation, and to draw appropriate conclusions
chain of custody
A list that records every official person who handles a piece of evidence. Those in the chain put their initials and the date on the evidence container.
material that can be associated with a group of items that share properties or characteristics ex jeans
crime scene investigation
a multidisciplinary approach in which scientific and legal professionals work togther to solve a crime
crime scene reconstruction
a hypothesis of the sequence of events from before the crime was committed through its commission
small but measurable amounts of physical or biological material found at a crime scene
Locard's Exchange Principle
contact between individuals and locations that leads to the exchange of trace evidence
Seven S's of Crime Scene Investigation
secure the scene , separate the witness, scan the scene, see, sketch, search, secure evidence
A microscope that has two compound light microscopes with an optical bridge, so that two samples can be viewed in a single eyepiece. It is used to match trace evidence such as fibers and bullet casings.
Middle layer of the hair, afibrous protein core formed by elongated cells containing melanin pigment
neutron activation analysis
A PROCEDURE THAT USES POSITRONS TO DETECT MANY DIFFERENT MEDICAL DISORDERS
measures the diameter of the medulla relative to the diameter of the hair shaft (humans less than 1/3, others more than 1/3)
A translucent piece of tissue surrounding the hair's shaft near the root. It contains the richest source of DNA associated with hair.
the transfer of evidence from a source (ex carpet) to a person (suspect) and then to another person (victim)
a fine cord of twisted fibers (of cotton or silk or wool or nylon etc.) used in sewing and weaving
erect bushy mallow plant or small tree bearing bolls containing seeds with many long hairy fibers
The simplest weave in which the weft (crosswise) yarn is passed over then under each warp (lengthwise) yarn.
a weave in which the filling and warp threads intersect in such a way as to give a smooth compact surface with no distinguishable twill line
a weave in which the filling strand goes over and under several warp strands, creating diagonal ridges across the fabric.
warp yarns do not like parallel to each other. Warp yarns work in groups, usually pairs. Warp yarns cross over each other and the filling is inserted in between
the number & type of pollen grains found in a geographic area at a particlur time of year
transfer of pollen from the male reproductive structure to the female reproductive structure
a fingerprint pattern in which the ridge pattern originates from one side of the print and leaves from the other
a triangular ridge pattern with ridges that go in different directions above & below a triangle
A fingerprint made by deposits of oils and/or perspiration, not usually visible to the human eye.
a fingerprint pattern in which the ridge pattern flows inward and returns in the direction of the origin
the combination of details in the shapes & positions of ridge patterns that make each fingerprint unique
a visible fingerprint that happens when a finger has blood, ink, or some other substance on it