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33 Cards in this Set
- Front
- Back
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Name 5 substances that may aacumlate on the bottom of yourshoe
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dust, dirt, residue, grease, moisture, oil
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3 types of footprints
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latent patent and 3D
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3 surfaces where a shoeprint can leave a 3D impression
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Sand, soil, snow
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Name 5 surfaces on which 2D footprints maybe made
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tile, wood-flooring, doors from kicking
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To accurately identify a footwear impression, both _____ and __________ characteristics must agree.
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class and individual
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________ ________ contain thousands of shoe designs that the FBI can use to try to determine the brand of the shoe that made a print found at the scene of the crime
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footwear databases
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Linking crimes using footwear impression databases can be particularly useful in investingations of __________ crimes and in ________ cities
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repetive crimes
populated |
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What can a shoe size be accurately determined from an impression>
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manufacturer of footwear is known
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When must a general estimate of a shoes size be made?
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the dimensions of full or nearly full impressions can allow general estimate.
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What other evidence might shoeprints help you find?
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located discarded weapons and tire prints
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What is "sign"?
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evidence refered to by trackers
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What might a sign include?
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shoe prints
bare footprints crushed debris sticks leaves displaced rocks |
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What is tracking used for?
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tracking illegal aliens
Finding location of missing children track criminals from scene of crime |
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Why are all footwear impressions even partial important in a crime scene?
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Even partial footprints contain sufficent information, sometimes
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y must a crime scene be closed off asap?
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da shoes of other individuals can track over evidence
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How might investigators throughly search a crime scene 4 footprints?
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high intensity oblique lighting
electro static lifting pieces of paper magazines broken glass |
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What is the importance of taking crime scene photographs?
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to document and reconstruct the scene and relevance of crime
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How can footprints in snow be photographed with betta contrast?
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it can be highlighted with a light spray of snow print wax
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Why is an exampled of a dry-orgin impression?
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A person walking across a carpet and then steps on a cleaner surface will create dry impression
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Wat is the advantage of using electrostatic lifting?
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the evidence will not be harmed and other methods can still be used
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What would cause an electrostatic lift to be unsucessful?
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if impression is wet impression
or other materials that have bonded to surface |
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How can fingerprint powder be used with footwear evidence?
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can be used to enchance impression
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What can be used to lift a dusted footprint?
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Mikrosil
gelatin adhesive lifter |
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How do you determine what color lifting material to use?
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A good contrast color
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Best material to make 3D casts is
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Dental stone
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Advantages of using Dental Stone are
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set much harder
high compressive strength quicker easier way to recover impressions |
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How is dental stone often brought to the crime scene?
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already prepared in ziplock bag
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How long can lift dental stone from ground?
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20 minutes
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How long before dry enough to safely clean off debris?
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24 to 48 hrs
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What types of photographic methods can be used to enchance shoeprints?
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oblique lighting
high contrast ultraviolet infared alternate light sources |
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Wat is included in physical methods of enchancing shoeprints?
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lifitng impressions
powdering impressions detecting indented footwear impressions |
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What types of footprints maybe treated with chemical reagents?
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blood footwear impressions
no bloddy |
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Adoble photoshop can enchance a digital picture of a shoeprint by
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increase contrast/birhgtness
improve visualization |
