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Impressions

Impressions. Shoe Impression Characteristics. Class characteristics Type of shoe Shoe brand Size Individual characteristics Wear pattern Outsole Insole. Shoeprint and Tire Tread Casting . Making a plaster cast of a print . Spray the dirt with hair spray

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Impressions

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  1. Impressions

  2. Shoe Impression Characteristics • Class characteristics • Type of shoe • Shoe brand • Size • Individual characteristics • Wear pattern • Outsole • Insole

  3. Shoeprint and Tire Tread Casting

  4. Making a plaster cast of a print • Spray the dirt with hair spray • This helps hold the print in place for the plaster • Mix 2 cups of plaster with 1 cup of water in a large plastic bag • Should be the consistency of pancake batter • Cut 1 corner of the bag to pour out the plaster

  5. Start at one end of the print, overlapping the plaster and cover the entire print • Place toothpicks in crisscross pattern • This will strengthen the plaster form • Let dry and harden

  6. Other methods • Could also use magnetic fingerprint dust to attach to print on clean surface • Electrostatic paper could cast dust to cling to paper and make shoe print • Adhesive sheets to lift dust prints off a floor

  7. Obtaining Controls from Suspect • Take shoe cleaning sponge or ink roller and roll on bottom of shoe • Have shoe make a complete outsole print on paper • Use impression box with soft foam

  8. Look for at least 4 individual characteristics with impression to match the shoes worn at the crime scene. • Sometimes you can’t be sure if the impression at the scene is a match, that’s ok.

  9. TOOL MARK IMPRESSIONS • Impressions • Cuts • Gouges • Abrasions

  10. TOOL MARK IMPRESSIONS • SUBMIT ENTIRE OBJECT • PACKAGE SEPARATELY (ALWAYS!) • DO NOT ATTEMPT TO FIT THE TOOL INTO THE TOOL MARK

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