What is the most common type of paint examined in crime labs?
One of the most common types of paint examined in the crime laboratory involves finishes emanating from automobiles. Automobile manufacturers normally apply a variety of coatings to the body of an automobile.
What is the most important physical property of paint evidence for comparison purposes?
34 Cards in this Set
|The _ component of paint is commonly a mixture of inorganic and organic compounds and imparts color and hiding (or opacity).||pigment|
|In forensic comparison the most important physical property of paint is _.||layer structure|
Which property of paint imparts it with its most distinctive forensic characteristics?
|Paint as physical evidence is most frequently encountered in||burglary and hit and run|
|which property imparts paint with its most distinctive forensic characteristics||color-layer sequence|
|what is the main ingredient in ordinary glass||sand|
Which characteristic is most important in evaluating the significance of paint evidence?
Which of these characteristics is most important in evaluating the significance of paint evidence? Color, surface texture, and color layer texture. Color Layer Sequence is the most important.
What are the five major types of trace evidence?
Although the types of materials that might be used as trace evidence are nearly unlimited, hairs, fibers, paint, glass, and soil are the most common types analyzed in the microscopy laboratory.
Why is trace evidence so important?
Trace evidence is created when objects make contact. The material is often transferred by heat or induced by contact friction. Trace evidence is important in accident investigation, where the movement of one part against another will often leave a tell-tale mark. Such analysis is of great use in forensic engineering.
What is an example of trace evidence?
Fibers, hair, soil, wood, gunshot residue and pollen are only a few examples of trace evidence that may be transferred between people, objects or the environment during a crime. Investigators can potentially link a suspect and a victim to a mutual location through trace evidence.
Is blood considered trace evidence?
In addition to microscopic evidence, the trace evidence section also deals with physical evidence such as tire and shoeprint impressions. These can be found in several different types of materials, such as paint, blood, soil and dust.
Can trace evidence be used in court?
Any evidence or trace of physical matching which can be used to identify a missing perpetrator of in a crime scene amounts to forensic evidence. This includes fingerprints, strands of hair, glove prints, tire marks and others.
What is the most important piece of trace evidence?
Trace evidence can include a wide variety of materials, but the most commonly tested are hair, fibers, paint and glass. Other, less frequently included items are soil, cosmetics and fire debris.
Which has more probative value?
Individual evidence can prove something that is material to a crime. Fingerprints are considered to have high probative value because they can belong to only one person. Class evidence does not generally prove a fact, except in cases where it exonerates or eliminates individuals.
Which feature of hair is most important in making a species identification *?
At the centre of the hair shaft is the medulla, which is also valuable for species identification. Animals’ medullary index (ratio of the medulla’s diameter relative to the shaft’s diameter) is greater than humans’. Humans have a medullary index of less than 1/3 while the medullary index of animals is greater than 1/3.
Under what conditions can hair be individualized?
Not necessarily, because although hair cannot be individualized without DNA testing, it can be closely classified by comparing the specific characteristics of known and questioned specimens. Individual characteristics are most pronounced in hair from the scalp.
Is hair a dead cell?
Tiny blood vessels at the base of every follicle feed the hair root to keep it growing. But once the hair is at the skin’s surface, the cells within the strand of hair aren’t alive anymore. The hair you see on every part of your body contains dead cells.
What is the function of the hair bulb?
The hair bulb forms the base of the hair follicle. In the hair bulb, living cells divide and grow to build the hair shaft. Blood vessels nourish the cells in the hair bulb, and deliver hormones that modify hair growth and structure at different times of life.
What makes hair follicles grow?
Your hair begins growing from a root in the bottom of the follicle. Blood from the blood vessels in your scalp feeds the root, which creates more cells and makes the hair grow.
What stimulates hair follicles?
Their proven benefits can help to stimulate growth and enhance the hair that you have.
- Massage. Massaging the scalp can help to restore hair growth and can be used in conjunction with hair oils and masks.
- Aloe vera.
- Coconut oil.
- Fish oil.
- Onion juice.
- Rosemary oil.
What causes hair follicles to die?
It is through problems like scalp trauma scarring or hereditary conditions that hair follicles are unable to renew hair growth. Once damaged, the hair follicles shrink and make the hair finer and fragile until they die completely and hair loss and balding become permanent.
Is GREY hair dead hair?
When the keratinocytes undergo their scheduled death, they retain the melanin. Thus, the pigment that is visible in the hair and in the skin lies in these dead keratinocyte bodies. Gray hair, then, is simply hair with less melanin, and white hair has no melanin at all.
Is nail a dead cell?
Your visible nails are dead As new cells grow, they push old ones through your skin. The part you can see consists of dead cells. That’s why it doesn’t hurt to cut your nails.