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62 Cards in this Set
- Front
- Back
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Which of the following materials would be excellent to make a cast of extremely faint hammer blows on a safe?
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Posmoulage
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What is the approximate circumference of a tire, in feet?
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5 to 8
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When using a hollow cast with melted moulage, how many minutes should you let it stand before pouring out the excess moulage?
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2 to 3
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When a laboratory examines cast and mold evidence, class and individual characteristics are considered.
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True
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Which of the following types of markers may be used to mark glass fragments.
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Grease pencil
Diamond point pencil Carborundum pencil |
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Refers to the change of direction of a ray of light passing through a medium.
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Refractive Index
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Based on the fact that mineral constituents impart a distinctive reaction when this technique is used.
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Flourescence
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This technique is based on comparing the characteristics of known and unknown pieces of glass.
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Density
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Has the greatest value in demonstrating major differences between two samples.
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Spectrographic analysis
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Made when a tool is pressed against or into a receiving surface.
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Negative impression
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Made when a crowbar is forcefully inserted into a space between a door and the door facing.
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Combination mark
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Made when a tool cuts into or slides across a surface.
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Friction mark
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Usually made when a crowbar is used to pry open a door or window.
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Negative impression
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An impression, cut, scratch, or abrasion made when a tool is brought into contact with an object.
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Tool mark
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This type of mark may be made by a bolt cutter.
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Friction mark
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Tool mark evidence may be used for a which of the following reasons?
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To link a person who uses a given tool with the crime scene.
To establish a connection between similar evidence discovered in a series of crimes. To compare a tool mark from a crime scene with a tool mark found on the property of a suspect. |
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When processing a tool mark as evidence, how many different courses of actions, are available to the investigator?
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Three
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What are the courses of action to the investigator in regards to tool markings?
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Remove the original evidence or the desired portion.
Cast or mold evidence Request that an examiner from a criminal investigation laboratory come to the scene and develop evidence. |
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A casting can be just as good or better than the original impression.
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False
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An area containing a tool mark that is removed as evidence should be marked with all EXCEPT which information?
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Case Number
Investigator's Initials Date and Time of removal (except)Command's Name |
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Serial numbers on manufactured objects are made up of which...?
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Individual letters
Combination of Numbers Combination of Numbers, letters and symbols |
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Serial numbers are usually attached to objects in which ways?
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Engraved
Permanent Ink Etched |
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On a normal person, blood usually begins to clot after how many minutes?
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3 to 5 min.
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What color is blood after it has completely dried?
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Reddish-brown
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When a drop of blood falls from 6 to 12 in. the bloodstains appear as a circular disk on a smooth surface.
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True
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When a drop of blood falls from 12 to 60 in. the bloodstains appear jagged.
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True
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When a drop of blood falls from 2 to 3 yards, it may splash upon impact and form many small bloodstains.
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True
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Blood usually clots in approximately how many minutes?
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10 to 20 min.
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Before sending a bloodstained article to the lab for examination it should be throughly dried. How should the drying process be completed?
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Place the article where it can dry naturally.
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What fraction of an ounce of blood is required for laboratory examination?
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1/6
5 cubic centimeters |
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How many tubes of blood should be submitted to the lab for examination?
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Two
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Human blood is classified into a total of how many blood groups?
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Four
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In the continental US what is the approximate percentage of people who belong to blood group AB.
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5%
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In the continental US what is the approximate percentage of people who belong to blood group O?
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43%
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Grouping dried blood stains is considerably more difficult than grouping liquid blood.
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True
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When human blood is examined in the laboratory, the preferred test is the precipitin test.
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True
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For blood group testing, what size bloodstains is generally sufficient for a conclusive determination?
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1/2 x 1/4 in.
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Approximately what percentage of the population are secretors?
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80%
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A continous dark line of varying width running up the center. (Hair Evidence)
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Medulla
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The outer surface of the hair.
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Cuticle
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Similar to overlapping shingles on a roof.
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Cuticle
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The inner portion of the hair.
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Cortex
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The core portion of the hair shaft.
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Medulla
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Contains the pigmentation of the hair.
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Cortex
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What is usually the first thing a laboratory determines about a hair sample?
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If it is human or animal
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In the case of human hairs the lab determinations may included which...?
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How the hair was removed.
How the hair was treated. Blood grouping. |
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Contact between two pieces of fabric seldom can be made without an interchange of fiber material.
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True
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When known samples from a victim or suspect are collected, what minimum quantity of hair or fabric strands should be collected?
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20
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When you secure soil for comparison samples, about how much soil should be collected?
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2 tablespoons
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When soil sample is taken, it is seldom necessary to dig deeper than how many inches?
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1/2 to 3/4 in.
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Permits qualitive and quantitive analysis of a substance.
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Gas-liquid chromatography
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Material to be analysed is injected.
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Gas-liquid chromatography
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Has no flourescent effect that can be seen with the unaided eye.
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Infrared light
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The light emission phenomenon resulting is one of flourescence.
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Ultraviolet light
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Minute quantities of evidentiary material are often analyzed.
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Spectrograph
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A mixture of several substances may be analyzed.
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Gas-liquid chromatography
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Produces a graph showing the basic constituents and trace elements.
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Spectrograph
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Uses a slightly shorter wavelength than a normal visible light.
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Ultraviolet light
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The application of this instrument lies primarily in its identification and analysis of substances.
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Spectrophotometer
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Uses a slightly longer wavelength than normal visible light.
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Infrared light
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Conditions under which polygraph examinations may be conducted are set forth in which manual?
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SECNAVINST 5520.4
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Only DOD-certified examiners or intern examiners under direct supervision of a certified examiner are authorized to conduct polygraph examinations.
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True
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