OIC Forensic Science & Analysis 3

Question 1

In forensic document examination, which technique is used to detect erasures or alterations on paper without damaging the document?

Accepted Answer

Infrared reflectography and oblique lighting examination

Answer

Infrared reflectography and oblique lighting reveal indented writing, erasures, and ink differences without physically altering the document.

Question 2

When performing a trajectory analysis for a gunshot, an inspector uses trajectory rods. What information do these rods primarily establish?

Accepted Answer

The angle and direction from which a projectile traveled

Answer

Trajectory rods inserted into bullet holes establish the angle and direction of travel, helping to reconstruct the shooter's position.

Question 3

A forensic toxicology report identifies a blood alcohol concentration (BAC) of 0.18% in a deceased individual. In Oregon, the legal driving limit is:

Accepted Answer

0.08%

Answer

Oregon, like all US states, sets the per se legal BAC limit for driving at 0.08%, meaning 0.18% is more than twice the legal limit.

Question 4

Fourier Transform Infrared Spectroscopy (FTIR) is most commonly used in forensic analysis to:

Accepted Answer

Identify unknown substances by their molecular absorption patterns

Answer

FTIR produces a unique infrared spectrum acting as a molecular fingerprint to identify unknown drugs, fibers, paints, and other materials.

Question 5

Which chain of custody requirement is MOST critical when transferring biological evidence between an Oregon inspector and a forensic laboratory?

Accepted Answer

Signed documentation recording who transferred the evidence, when, and why

Answer

A signed, dated transfer log creates an unbroken documentary record that can withstand legal scrutiny and proves evidence integrity.

(OIC) Oregon Inspector Certification Practice Test