CSI - Crime Scene Investigator Impression and Pattern Evidence Questions and Answers

Question 1

An investigator discovers a faint, two-dimensional dusty footwear impression on a dark-colored tile floor.
Which of the following collection methods would be most effective for recovering this type of evidence?

Accepted Answer

Electrostatic dust print lifter

Answer

Gelatin lifter

Answer

Dental stone casting

Answer

Adhesive lifter with fingerprint powder

Question 2

A three-dimensional footwear impression is found in mud at an outdoor crime scene. Before casting with dental stone, what is a critical first step in the documentation process?

Accepted Answer

Taking examination-quality photographs at a 90-degree angle with a scale.

Answer

Spraying the impression with a fixative like hairspray.

Answer

Removing any leaves or twigs embedded in the impression.

Answer

Building a retaining wall around the impression.

Question 3

A forensic examiner is comparing a tool mark from a crime scene with a suspect's pry bar. The examiner notes that both the questioned mark and the test mark were made by a tool with a 1-inch flat tip. This observation relates to what type of characteristic?

Accepted Answer

Class characteristics

Answer

Subclass characteristics

Answer

Individual characteristics

Answer

Accidental characteristics

Question 4

At a homicide scene, a bloody footwear impression is discovered on a light-colored linoleum floor. The impression is visible but faint. Which chemical enhancement technique is most appropriate for improving the detail of this bloody pattern for photography?

Accepted Answer

Amido Black

Answer

Ninhydrin

Answer

Cyanoacrylate fuming

Answer

Luminol

Question 5

Which of the following describes a 'plastic' impression?

Accepted Answer

A tire track left in soft soil or snow.

Answer

A bloody shoeprint on a white tile floor.

Answer

A dusty footprint on a wooden plank.

Answer

A fingerprint lifted from a glass surface.

Question 6

When casting a footwear impression in snow, which material is commonly sprayed into the impression first to insulate and firm it up before applying dental stone?

Accepted Answer

Gray primer or Snow Print Wax

Answer

Talcum powder

Answer

Potassium sulfate

Answer

Hairspray