ETC ETC Fingerprint & Biometric Evidence 2

Question 1

Which fingerprint development technique is most appropriate for latent prints on wet evidence?

Accepted Answer

Small particle reagent (SPR)

Answer

Small particle reagent (SPR) is a suspension of molybdenum disulfide that adheres to fatty components of latent prints even on wet surfaces.

Question 2

What is the ACE-V methodology used in latent print examination?

Accepted Answer

Analysis, Comparison, Evaluation, and Verification — the scientific method for fingerprint examination

Answer

ACE-V (Analysis, Comparison, Evaluation, Verification) is the standardized scientific methodology used by latent print examiners to reach identification conclusions.

Question 3

An evidence technician finds a bloody print at a scene. Which technique should be used to enhance it?

Accepted Answer

Amido black or leuco crystal violet staining

Answer

Amido black and leuco crystal violet react with proteins in blood to intensify and enhance bloody prints for photography and comparison.

Question 4

What is the primary difference between a patent print and a latent print?

Accepted Answer

A patent print is visible to the naked eye; a latent print requires development to be seen

Answer

Patent prints are visible without enhancement (e.g., prints in blood or grease), while latent prints are invisible and require development techniques to visualize.

Question 5

How many points of comparison are required by US federal standards to declare a fingerprint identification?

Accepted Answer

There is no mandated minimum — examiners use a holistic sufficiency standard

Answer

The FBI and most US agencies follow a sufficiency standard rather than a fixed point minimum; the examiner must find sufficient unique features without unexplained differences.

(ETC) Evidence Technician Certification Practice Test

(ETC) Evidence Technician Certification Practice Test

ETC ETC Fingerprint & Biometric Evidence 2