Arizona Forensic Science Technician
Certification Questions And Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. Which of the following is the primary role of a forensic science
technician at a crime scene?
A. Determine guilt or innocence of suspects
B. Collect and preserve physical evidence
C. Conduct legal interrogations
D. Issue arrest warrants
Answer: B. Collect and preserve physical evidence
Rationale: Forensic science technicians focus on the scientific aspects
of crime investigation. Their primary responsibility is properly
collecting, documenting, and preserving physical evidence so it can be
analyzed and presented in court without contamination or loss of
integrity.
2. What is the first step when arriving at a crime scene?
A. Collect fingerprints
, B. Interview witnesses
C. Secure and assess the scene
D. Package evidence
Answer: C. Secure and assess the scene
Rationale: The scene must be secured immediately to prevent
contamination, destruction, or removal of evidence. Once secured,
investigators can begin assessment and documentation before
collecting evidence.
3. Which documentation method provides a visual representation of
evidence location?
A. Crime scene sketches
B. Laboratory reports
C. Evidence logs
D. Chain-of-custody forms
Answer: A. Crime scene sketches
Rationale: Crime scene sketches provide spatial relationships between
items of evidence and the scene environment. They complement
photographs and written notes to create an accurate representation
for investigators and courtroom presentations.
4. The chain of custody refers to:
A. Ownership of the evidence
, B. Sequence of individuals who handled the evidence
C. The legal custody of suspects
D. The location of the crime scene
Answer: B. Sequence of individuals who handled the evidence
Rationale: Chain of custody documentation tracks every person who
collected, transferred, examined, or stored evidence. This ensures the
integrity and admissibility of the evidence in court.
5. Which biological sample is commonly used for DNA analysis?
A. Paint chips
B. Blood
C. Glass fragments
D. Soil
Answer: B. Blood
Rationale: Blood contains nucleated cells that provide DNA for
forensic analysis. DNA profiling from blood is widely used for
identifying individuals or linking suspects to crime scenes.
6. What type of evidence is hair without a follicle?
A. Individual evidence
B. Class evidence
C. Trace evidence
D. Circumstantial evidence
, Answer: B. Class evidence
Rationale: Hair lacking a root typically cannot provide nuclear DNA
and therefore can only indicate characteristics shared by a group,
making it class evidence rather than individualizing evidence.
7. Which tool is commonly used to collect trace evidence such as
fibers?
A. Vacuum device with filter
B. Hammer
C. Scalpel
D. Crowbar
Answer: A. Vacuum device with filter
Rationale: Specialized forensic vacuums with filters allow technicians
to collect minute particles such as fibers, hair, and dust while
preserving them for laboratory analysis.
8. Fingerprint identification relies on which principle?
A. All fingerprints are identical
B. Fingerprints change every decade
C. No two fingerprints are exactly alike
D. Fingerprints disappear with age
Answer: C. No two fingerprints are exactly alike
Rationale: Fingerprints are unique to each individual and remain
Certification Questions And Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. Which of the following is the primary role of a forensic science
technician at a crime scene?
A. Determine guilt or innocence of suspects
B. Collect and preserve physical evidence
C. Conduct legal interrogations
D. Issue arrest warrants
Answer: B. Collect and preserve physical evidence
Rationale: Forensic science technicians focus on the scientific aspects
of crime investigation. Their primary responsibility is properly
collecting, documenting, and preserving physical evidence so it can be
analyzed and presented in court without contamination or loss of
integrity.
2. What is the first step when arriving at a crime scene?
A. Collect fingerprints
, B. Interview witnesses
C. Secure and assess the scene
D. Package evidence
Answer: C. Secure and assess the scene
Rationale: The scene must be secured immediately to prevent
contamination, destruction, or removal of evidence. Once secured,
investigators can begin assessment and documentation before
collecting evidence.
3. Which documentation method provides a visual representation of
evidence location?
A. Crime scene sketches
B. Laboratory reports
C. Evidence logs
D. Chain-of-custody forms
Answer: A. Crime scene sketches
Rationale: Crime scene sketches provide spatial relationships between
items of evidence and the scene environment. They complement
photographs and written notes to create an accurate representation
for investigators and courtroom presentations.
4. The chain of custody refers to:
A. Ownership of the evidence
, B. Sequence of individuals who handled the evidence
C. The legal custody of suspects
D. The location of the crime scene
Answer: B. Sequence of individuals who handled the evidence
Rationale: Chain of custody documentation tracks every person who
collected, transferred, examined, or stored evidence. This ensures the
integrity and admissibility of the evidence in court.
5. Which biological sample is commonly used for DNA analysis?
A. Paint chips
B. Blood
C. Glass fragments
D. Soil
Answer: B. Blood
Rationale: Blood contains nucleated cells that provide DNA for
forensic analysis. DNA profiling from blood is widely used for
identifying individuals or linking suspects to crime scenes.
6. What type of evidence is hair without a follicle?
A. Individual evidence
B. Class evidence
C. Trace evidence
D. Circumstantial evidence
, Answer: B. Class evidence
Rationale: Hair lacking a root typically cannot provide nuclear DNA
and therefore can only indicate characteristics shared by a group,
making it class evidence rather than individualizing evidence.
7. Which tool is commonly used to collect trace evidence such as
fibers?
A. Vacuum device with filter
B. Hammer
C. Scalpel
D. Crowbar
Answer: A. Vacuum device with filter
Rationale: Specialized forensic vacuums with filters allow technicians
to collect minute particles such as fibers, hair, and dust while
preserving them for laboratory analysis.
8. Fingerprint identification relies on which principle?
A. All fingerprints are identical
B. Fingerprints change every decade
C. No two fingerprints are exactly alike
D. Fingerprints disappear with age
Answer: C. No two fingerprints are exactly alike
Rationale: Fingerprints are unique to each individual and remain
