ETC Trace Evidence

Question 1

Which principle forms the scientific foundation for trace evidence and states that every contact leaves a trace?

Accepted Answer

Locard's Exchange Principle

Answer

Daubert Standard

Answer

Frye Standard

Answer

Bertillon Identification System

Question 2

Which type of microscope is most commonly used by forensic analysts to directly compare hair and fiber evidence side by side?

Accepted Answer

Comparison microscope

Answer

Scanning electron microscope

Answer

Phase contrast microscope

Answer

Fluorescence microscope

Question 3

What physical property of glass fragments is measured to help determine whether two samples share a common origin?

Accepted Answer

Refractive index

Answer

Tensile strength

Answer

Surface hardness (Mohs scale)

Answer

Thermal conductivity

Question 4

What is the primary limitation of microscopic hair comparison as standalone forensic evidence?

Accepted Answer

It cannot provide the individualization to a single source that DNA can

Answer

Hair degrades too quickly to be useful

Answer

It cannot be performed without DNA testing

Answer

It requires equipment unavailable in most crime labs

Question 5

How should trace evidence such as loose fibers or hair be packaged at the crime scene to prevent loss?

Accepted Answer

In paper envelopes or using a druggist fold

Answer

In sealed plastic zip-lock bags

Answer

Loose inside a standard evidence box

Answer

In glass vials submerged in saline

Question 6

A tape lift is used at a crime scene primarily to:

Accepted Answer

Collect loose hair, fibers, and small particles from surfaces

Answer

Develop latent fingerprints on smooth surfaces

Answer

Preserve shoeprint impressions in soft soil

Answer

Stabilize bloodstain patterns for transport

Question 7

Which type of transfer involves trace evidence moving from the original source to a secondary surface through an intermediary object or person?

Accepted Answer

Secondary transfer

Answer

Direct transfer

Answer

Reciprocal transfer

Answer

Primary transfer