ABFM Technology & Digital Tools 3 — Questions and Answers
Question 1: In forensic DNA analysis, what is the purpose of the polymerase chain reaction (PCR) step?
- To sequence the entire human genome
- To amplify small quantities of DNA to detectable levels (Correct answer)
- To separate DNA fragments by size
- To identify specific protein markers
Correct answer: To amplify small quantities of DNA to detectable levels
PCR exponentially amplifies targeted DNA regions from minute samples, enabling analysis of trace biological evidence that would otherwise be insufficient for profiling.
Question 2: A forensic examiner is analyzing electronic communications. Which metadata element from an email header is most critical for establishing a timeline of events?
- Subject line content
- UTC timestamp with time zone offset (Correct answer)
- Reply-to address
- MIME version
Correct answer: UTC timestamp with time zone offset
UTC timestamps with time zone offsets provide an absolute, unambiguous chronological record of when an email was sent or relayed, critical for establishing accurate event timelines.
Question 3: Which imaging modality provides the best soft tissue detail in post-mortem forensic radiology for detecting cause of death in decomposed remains?
- Plain film X-ray
- Computed tomography (CT)
- Magnetic resonance imaging (MRI) (Correct answer)
- Positron emission tomography (PET)
Correct answer: Magnetic resonance imaging (MRI)
Post-mortem MRI provides superior soft tissue contrast compared to CT, making it valuable for detecting brain injuries, organ pathology, and cause of death even in partially decomposed remains.
Question 4: In digital evidence handling, what is the purpose of generating an MD5 or SHA-256 hash of a forensic image?
- To compress the image for storage
- To encrypt the image for security
- To verify the image is an exact, unaltered copy of the original (Correct answer)
- To catalog the image in a database
Correct answer: To verify the image is an exact, unaltered copy of the original
Cryptographic hashes create a unique digital fingerprint of the forensic image that can be recalculated at any time to prove the data has not been altered since acquisition.
Question 5: Which spectroscopic technique is used to identify chemical compounds in trace evidence at the scene without destroying the sample?
- Inductively coupled plasma mass spectrometry
- Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) (Correct answer)
- High-performance liquid chromatography
- Gas chromatography-mass spectrometry
Correct answer: Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR)
ATR-FTIR is a non-destructive technique that identifies compounds by their infrared absorption patterns, ideal for analyzing trace evidence without consuming the sample.
Question 6: In forensic facial reconstruction software, what primary data source is used as the anatomical foundation for rebuilding a face from skeletal remains?
- Dental records from the victim
- Soft tissue depth data tables derived from population studies (Correct answer)
- Witness descriptions of the deceased
- DNA phenotyping results
Correct answer: Soft tissue depth data tables derived from population studies
Forensic facial reconstruction uses standardized tissue depth tables derived from cadaver and ultrasound studies to approximate soft tissue thickness at anatomical landmarks on the skull.
Question 7: A forensic investigator discovers steganography on a suspect's computer. What does this technique involve?
- Encrypting files with a password
- Hiding data within other non-secret files such as images or audio (Correct answer)
- Using anonymous browsing tools to hide internet activity
- Creating fake file extensions to disguise file types
Correct answer: Hiding data within other non-secret files such as images or audio
Steganography conceals secret information within ordinary-looking digital files (images, audio, video) so that the hidden data is not apparent to casual observers.
ABFM Technology & Digital Tools 3
In forensic DNA analysis, what is the purpose of the polymerase chain reaction (PCR) step?