Question

1. (True/False) Small and sometimes microscopically unique markings can be directly traced to the object or instrument in question.
a) True
b) False

2. Describe the differences between compression marks and scraping marks.

3. Which of the following could be an individual characteristic that might be found on a footwear impression at a crime scene?
a) Size
b) Width
c) Marks of nails and pegs
d) Brand of the footwear

Answer 1

Answer:

1. True

2. Compression marks are left from an instrument which is pushed into a material capable which can pick up an impression.

Scraping marks are a result of  a combination of pressure and sliding contact by the tool.

3. c) Marks of nails and pegs

Explanation:

Explanation:

1) These markings are specific, characteristic for a tool used. If they are examined under a microscope and the tool markings are compared to samples the object can be identified.

2) Compression marks  can be found on shoes, tires and include bite mark and also impressions of a hammer on wood, to name a few.

Scraping marks  result in microcopic striations to the surface upon which the tool was applied. Some examples include: screwdriver blade dragged accross a surface or a bullet scrape.

3) Apart from telling an investigator that a particular type of shoes was worn by a perpetrator, footwear can positively place the perpertrator at the scene of the crime. Each footwear is unique and the sole is different depending on the use and manner of walking. So, nails and pegs can idenitify a shoe.