Impression Evidence Collection Techniques

This video tutorial covers the concept of impression evidence, focusing on how to collect and analyze tire tracks and shoe prints at a crime scene. It explains the process of using plaster to create casts of tire tracks and describes an experiment to collect shoe print impressions using paper and crayon. The tutorial emphasizes the importance of these techniques in linking evidence to suspects.

What is the primary purpose of impression evidence in a crime scene investigation?

• To identify the suspect's fingerprints

• To analyze the crime scene layout

• To link physical marks to a suspect's belongings

• To determine the time of the crime

What is a major challenge when dealing with tire tread evidence?

• Tire treads are not unique

• There are thousands of different tire treads

• The treads are often too small to see

• Tire treads change frequently

Why is plaster used in collecting tire track impressions?

• It is the only material that can be used outdoors

• It is the cheapest material available

• It can capture fine details of the tire tread

• It is easy to remove from the crime scene

What is the first step in creating a plaster impression of a tire track?

• Measure the depth of the track

• Mix the plaster until smooth

• Pour the plaster directly onto the track

• Clean the tire track thoroughly

What is the significance of a matching tire impression at a crime scene?

• It proves the suspect was driving the vehicle

• It confirms the suspect's vehicle was at the scene

• It identifies the suspect's intent

• It reveals the suspect's identity

What additional evidence can be collected using impression techniques?

• Hair fibers

• Fingerprints

• DNA samples

• Shoe tracks

What materials are needed for the shoe print experiment?

• Volunteers, paint, brush, cardboard

• Volunteers, chalk, string, colored paper

• Volunteers, measuring tape, crayon, white paper

• Volunteers, ink pad, ruler, black paper

How do you measure the length of a shoe sole?

• From the inside of the shoe

• From the top of the shoe to the bottom

• From the tip of the toe to the heel

• From the side of the shoe

What is the correct method to collect a shoe print impression?

• Press a sheet of paper over the sole and rub with a crayon

• Press the shoe into wet cement

• Dip the shoe in ink and step on paper

• Trace the shoe outline on paper

What should you expect if the shoe print impression is done correctly?

• A faint outline of the shoe

• A detailed impression of the shoe's tread pattern

• A smudged image of the shoe

• A reversed image of the shoe