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Forensics: Prints/Pattern

Forensics: Prints/Pattern. Prints: Marks left when an object is pressed against the surface of another object. Imprints vs. Impressions. * Imprints: flat prints with only two dimensions. *Impressions: - prints with three dimensions (l, w, h)

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Forensics: Prints/Pattern

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  1. Forensics: Prints/Pattern

  2. Prints:Marks left when an object is pressed against the surface of another object.

  3. Imprints vs. Impressions *Imprints:flat prints with only two dimensions *Impressions: - prints with three dimensions (l, w, h) - left when an object is pressed into a surface

  4. Types of Prints1. Shoe Prints2. Tire Treads3. Skid Marks4. Tool Marks5. Gloves

  5. Types of PrintsShoe Prints – - consider size of the print (l /w) - pattern on the sole - wearing of the sole (like a fingerprint – unique)

  6. Types of PrintsTire Treads – Part of the tire that touches the road and is made up of alternating ribs and grooves.Wide RibsWide Grooves- help the tire grip the - help the tire grip the road on a dry day. road on a wet day.The pattern of ribs and grooves is distinctive for each brand and model of tire.

  7. Tire Imprints

  8. Types of PrintsSkid Marks– the mark left when a vehicle’s wheels slides along the surface of the roadReasons for sliding:- locked brakes- sharp turns at high speed

  9. Types of PrintsTool Marks– As a tool is pressed against a surface it leaves a distinct mark.New Tools: - likely to leave the same mark.Tools in Use: - nicks and scratches may be added to the blade leaving a distinct mark.

  10. Tool Marks- Marks left in behind by tools. Each tool leaves behind a different mark.

  11. Types of PrintsGloves– Gloves are worn by investigators to keep from leaving prints at a crime scene.Gloves can leave prints also: - imprints in dust can be used to compare the print pattern to a brand of gloves

  12. Preserving PrintsTaking Photographs*capture every detail of the impression possible.*a ruler should be placed by the impressiont o indicate the relative size of the mark madethere should be a number placed by each photo*a long-range and medium-rangephoto should be taken*

  13. Preserving PrintsMaking Casts* An object made by filling a mold with a liquid that makes the shape of the mold as it changes to a solid

  14. Cast Examples Shoeprint cast Tiretreadcast

  15. Preserving PrintsRemoving Objects* Some prints and evidence must be sent back to a lab for analysis- a photo will be taken to record evidence* Some items are not moveable- tool marks found on an item would be casted instead of being removed

  16. Comparing PrintsSearching a Database* Evidence can be compared to a data base of records to determine more information about it Comparing Prints to Objects * If the crime lab has the object that is suspected of making a print, they can compare the print the object makes to the one found at the crime scene.

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