Footwear and Tyres

Question 1

How long does it take for a mark on the body to develop

Answer 1

24-48 hours

Question 2

What are marks on the body made up of 3

Answer 2

dust
dirt
blood

Question 3

Where do you search for footmarks

Answer 3

• small areas
• path routes
  -existing light areas
• smooth surfaces

Question 4

Overall examination strategy

Answer 4

Examine for MARKS
Examine for SHOES
If similar compare the two

Question 5

Class Characteristics v Individual Characteristics

Answer 5

Class Characteristics - design , size
Individual Characteristics - wear and tear , damage

Question 6

Recovery methods

Answer 6

Photography
ESLA
Gel Lifts
Casting 3D

Question 7

Photography

Answer 7

Non destructive
B&W contrast
Take from very angle

Question 8

ESLA - electrostatic lifting apparatus

Answer 8

Recovers positive and negative marks
Mylar film is used for contrast prints
Collects dust patterns
CANT be used in wet or damp conditions
Hard to store

Question 9

Gel lifts (2D)

Answer 9

Dry and wet marks can be lifted
Used on a range of services
Lifts dust marks
Can be used more than once

Question 10

Casting 3D

Answer 10

Characteristics captured
Can be used in a various conditions
requires alot of time
hard to remove

Question 11

Test print requirements

Answer 11

-similar size test subject
powdering
adhesive lift
labelling

Question 12

Comparing test prints

Answer 12

overlay prints
magnify
pattern size
physical shape
wear
damage