CFP Forensic Photographer Evidence Preservation & Analysis 3 — Questions and Answers
Question 1: Which file format is generally preferred for capturing examination-quality forensic images?
- RAW or uncompressed formats that retain maximum unprocessed data (Correct answer)
- Highly compressed JPEG to save card space
- GIF for easy sharing
- Screenshots of the camera's LCD preview
Correct answer: RAW or uncompressed formats that retain maximum unprocessed data
RAW or lossless formats preserve all sensor data without compression artifacts, which is critical for analysis and enhancement.
Question 2: During image enhancement of a latent fingerprint photograph, what must the analyst document?
- Every processing step applied, so the enhancement is repeatable and defensible (Correct answer)
- Only the final print resolution
- The brand of monitor used
- The examiner's certification number on each pixel
Correct answer: Every processing step applied, so the enhancement is repeatable and defensible
SWGIT-style guidelines require a documented, repeatable processing history so any qualified person can reproduce the enhancement from the original.
Question 3: What is the correct use of a hash value (e.g., MD5 or SHA-256) in forensic image workflows?
- Computed at acquisition and re-verified later to prove the file has not changed (Correct answer)
- Used to compress files for archiving
- Applied to sharpen the image before analysis
- Embedded visibly across the photo as a watermark
Correct answer: Computed at acquisition and re-verified later to prove the file has not changed
A hash acts as a digital fingerprint; a matching value later proves the image is bit-for-bit identical to the original.
Question 4: A photographer must document tire impressions at night. Which lighting technique best reveals the tread detail?
- Oblique (low-angle) lighting from a detached flash to create shadow contrast in the impression (Correct answer)
- On-camera direct flash aimed straight down
- Ambient streetlight only, with high ISO
- A ring light mounted on the lens
Correct answer: Oblique (low-angle) lighting from a detached flash to create shadow contrast in the impression
Oblique lighting rakes across the impression, casting shadows that reveal three-dimensional tread detail direct flash would flatten.
Question 5: Why are overall, midrange, and close-up photographs all required when documenting an item of evidence?
- Together they establish the item's location, its relationship to the scene, and its detail (Correct answer)
- Because juries prefer variety in exhibits
- To use up the full memory card
- Only close-ups are actually required; the rest are optional
Correct answer: Together they establish the item's location, its relationship to the scene, and its detail
The progressive series links the item's fine detail back to its precise position within the overall scene.
Question 6: An analyst is asked to brighten a dark image for court. Which action would render the image inadmissible or challengeable?
- Cloning or copying pixels to add content that was not in the original exposure (Correct answer)
- Adjusting overall brightness and contrast on a working copy
- Documenting the adjustment steps in a processing log
- Retaining the original file unmodified
Correct answer: Cloning or copying pixels to add content that was not in the original exposure
Adding or fabricating content alters the substance of the evidence, unlike global tonal adjustments performed on a documented working copy.
Question 7: What is the primary risk of relying on a camera's automatic settings for critical evidence photography?
- Auto modes may misexpose or misfocus on the evidence, and the photographer cannot ensure accurate representation (Correct answer)
- Automatic modes drain batteries faster
- Auto settings embed incorrect copyright data
- Cameras in auto mode cannot store RAW files
Correct answer: Auto modes may misexpose or misfocus on the evidence, and the photographer cannot ensure accurate representation
Automatic metering and focus can be fooled by scene conditions, so the photographer must control exposure to ensure a fair and accurate representation.
CFP Forensic Photographer Evidence Preservation & Analysis 3
Which file format is generally preferred for capturing examination-quality forensic images?