Crime Scene (Power Point)

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Identification points1. Bifurcation - ridge forks and becomes two or more ridges.2. Ending ridge - ridge makes a sudden stop.3. Ridge island – ridge bifurcates and then forks into a ridge.4. Dot - self-explanatory.5. Short ridgeThere– nois nolongerspecificthannumberthe widthof comparisonof the correspondingpointsrequired for a positive ID.ridges.Only enough points are necessary to form an6. Divergenceopinion- spreadingin the mindapartof theofexperttwo ridgeswho isthatmakinghavethebeen running parallelcomparison.or nearly parallel.
“Visible", “Plastic", and “Latent"impressions.Visible impressions (dust prints).Plastic Impressions1. Print that has been defected with foreign matter.2. 1. If The a finger result is placed of the fingers a thin being layer pressed of dust, into the a dust soft may substance, coverthe such friction as putty, ridges. wet If paint, the finger soap, subsequently grease, tar or touches wax, and a clean are visuallysurface, a visible fingerprint may distinct. result.3. 2. A They visible are fingerprint also found may on recently also develop painted as surfaces, a result of in touching the gum onother substances stamps such or envelopes, as blood, and wood, on flour, adhesive ink or tapes. oil.4. Impressions are usually distinct and visible without the use ofadditional light.5. Should be a caution sign to an officer that there are probablysome good prints available.
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The student will be able to summari
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8. Do not permit personnel to begin
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Communication, between the search p
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Determining the search method and a
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Since all crime scenes are unique i
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Strip or Line search. This method,
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Circular (spiral or concentric) sea
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Elevation Zone Search
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Some investigative tools and equipm
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Bloodstain PatternDocumentationABFO
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Trace Evidence CollectionAcetate sh
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ImpressionBowls/mixing containers.B
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Guideline for conducting a crime sc
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Methods of conducting a preliminary
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Field notes
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Protection of a crime scene.Protect
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Once evidence has been located, rem
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Conducting a final survey of the cr
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After the Search is complete, but p
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The importance for maintaining a ca
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The importance for conducting a fol
Page 47 and 48: Sketching and Photographing
Page 49 and 50: The main reasons for using crime sc
Page 51 and 52: The crime scene sketch should inclu
Page 53 and 54: The finished sketch.a) A finished s
Page 55 and 56: D) If requested, dimensions and des
Page 58 and 59: The schematic sketch:Used to repres
Page 60 and 61: Prevalent sketch:Sketch of the gene
Page 62 and 63: Compass direction.A standard arrow
Page 64 and 65: Suitable scales for use in police w
Page 66 and 67: TitleThe title should contain data
Page 69 and 70: Rectangular CoordinatesObjects are
Page 71 and 72: Reasons for taking Crime Scene Phot
Page 73 and 74: Photographs should be taken prior t
Page 75 and 76: Photographic Log1. It is a complete
Page 77 and 78: Mid-range photographs.a. Usually ta
Page 79 and 80: 3. Centering on the results of the
Page 82 and 83: General standards used to review th
Page 84 and 85: The relationship between crime scen
Page 87: 10 feet from base point 1 to base p
Page 90 and 91: The methods of classifying fingerpr
Page 92 and 93: The only patterns usually used to d
Page 94 and 95: Methods for identifyingFINGERPRINTS
Page 96 and 97: Types of PatternsFingerprints may b
Page 100 and 101: Latent Impressions (patent fingerpr
Page 102 and 103: The quality of latent impressions c
Page 104 and 105: Protect all areas, as best you can,
Page 106 and 107: Dusting for Latent ImpressionsFor h
Page 108 and 109: Powder should be used sparingly.Dis
Page 110: Use lifting tape large enough to co
Page 113 and 114: Ninhydrin.This chemical acts as a d
Page 115 and 116: This solution reacts with sodium ch
Page 117 and 118: Print development by this method de
Page 119 and 120: In order Three to speed to four up
Page 121: THE AFIS SYSTEMAFIS technology uses
Page 124 and 125: First things first, make sure the p
Page 126 and 127: Recommended equipment:Inking plateC
Page 128 and 129: In taking rolled impressions, the s
Page 130: Closely observe the crime scene. It
Page 133: Be sure that you’ll be able to an
Page 136: Marking EvidenceAnyone who handles
Page 139 and 140: Each different itemshould be packag
Page 141 and 142: An unfortunate side affect of these
Page 143 and 144: LiquidsMost often encountered in ar
Page 145 and 146: Flammable liquids and accelerants e
Page 147 and 148: The firearm should behandled carefu
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Note the following conditions:Physi
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Avoid the front of revolver cylinde
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Marking firearms.a. Don't deface a
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When cylinders must be unloaded(1)
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Projectile evidence (expended bulle
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Collection and preservation of glas
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Paint evidence.1. Collection and pr
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Suspects clothing1. A suspect’s c
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Most illicit drugs come in one of s
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Stainsa. Blood is the stain found m
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3. Prints, such as latent prints an
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Precautions that should be taken to
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There are certain precautions, whic
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In the case of an accidental wound,
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Evidence stained with blood or body
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Even after evidence has been proper
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Safety precautions, safe work pract
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Hazardous materials transportation.
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ExplosivesBlasting caps, unstableex
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Preserving evidence during foul wea
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DNA (deoxyribonucleic acid)- the mo
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Important considerations of DNA eva
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Blood examinations cannot determine
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Methods of collecting known bloodsa
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Dried blood on aperson1. Absorb sus
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BloodstainsAir-dry wet bloodstained
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When possible, cut a large sample o
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Blood examination request letterA b
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Saliva on cigarette butts1. Pick up
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Saliva on envelopes and stamps1. Pi
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Dry saliva- or urine-stained object
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Semen stainsLiquid semen1. Absorb s
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Semen stains from immovable object1
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2. Refrigerate samples and submit t
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Hairs in the hand of the victims1.
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Methods of collecting Tissue, Bone,
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Place tissue samples in a clean, ai
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Socks1. Socks worn by a homicide vi
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WeaponsWeapons recovered at a crime
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Considerations of documenting, coll
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G. It may be necessary to use a var
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Search the burglarized structure to
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Checklist for burglary investigatio
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A. Response to a robbery crime scen
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Checklist for robbery and aggravate
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Investigating an alleged physical a
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Checklist for an assault, or aggrav
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3. Note and document the victim's c
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Medical treatment (specimens)a. Adv
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(3) Hair from the victim. Request a
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Crime Scene (Power Point)

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