OIC Forensic Science & Analysis 2

Question 1

When documenting a fire scene, which evidence collection technique best preserves accelerant residues for laboratory analysis?

Accepted Answer

Place debris in an airtight metal can sealed with an adhesive lid

Answer

Airtight metal cans prevent accelerant vapors from escaping and contamination from entering, preserving volatile compounds for GC-MS analysis.

Question 2

In bloodstain pattern analysis, a 'satellite spatter' pattern is produced by:

Accepted Answer

Secondary droplets that break off from the primary droplet upon impact

Answer

Satellite spatters are smaller droplets ejected outward from the main bloodstain when the primary droplet strikes a surface.

Question 3

Which chemical reagent is used to develop latent fingerprints on porous surfaces such as paper?

Accepted Answer

Ninhydrin

Answer

Ninhydrin reacts with amino acids in sweat residue on porous surfaces, producing a purple compound called Ruhemann's purple.

Question 4

An Oregon inspector observes tool mark evidence on a door frame at a burglary scene. The FIRST priority should be to:

Accepted Answer

Photograph the mark in place with a scale reference before any other action

Answer

Documentation through photography with a scale must occur before any physical handling to preserve the original condition of evidence.

Question 5

What does the term 'locard's exchange principle' mean in a forensic investigation context?

Accepted Answer

Whenever two objects contact each other, they exchange trace materials

Answer

Locard's Exchange Principle states that every contact leaves a trace — the perpetrator brings something to the scene and takes something away.

(OIC) Oregon Inspector Certification Practice Test