CSI Impression and Pattern Evidence 3

Question 1

What does 'class characteristics' mean in the context of shoe print evidence?

Accepted Answer

General features shared by all shoes of the same make, model, and size

Answer

Class characteristics identify a shoe as belonging to a particular design group but do not distinguish one specific shoe from another of the same type.

Question 2

A CSI finds a patterned tool mark on a door frame where a screwdriver was used to pry it open. What type of mark is this?

Accepted Answer

Striated mark

Answer

A striated (or striations) mark is produced when a tool slides across a surface, leaving parallel scratch marks unique to that tool's edge.

Question 3

In blood spatter analysis, what does a 'satellite spatter' indicate?

Accepted Answer

Small secondary droplets that break away when a primary drop strikes a surface

Answer

Satellite spatters are tiny droplets that radiate outward from the primary bloodstain upon impact, caused by the energy of the falling drop.

Question 4

When collecting a casting from a shoe impression in snow, which method helps prevent the cast from melting the impression?

Accepted Answer

Using Snow Print Wax spray as a protective layer before casting

Answer

Snow Print Wax is sprayed into the impression to create a barrier that prevents the exothermic reaction of dental stone from melting the snow detail.

Question 5

What is the significance of a 'void pattern' in blood spatter evidence?

Accepted Answer

It indicates an area where blood was absent because an object blocked the spatter

Answer

A void pattern is a blank area within a blood spatter distribution, indicating that an object or person was present and blocked blood from reaching that area.

(CSI) Crime Scene Investigator Practice Test

(CSI) Crime Scene Investigator Practice Test

CSI Impression and Pattern Evidence 3