Missouri Forensic Science Technician
Exam Practice Questions And Correct
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Rationale 2026 Q&A| Instant Download
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1. In forensic investigations, which primary role does a forensic science
technician perform at a crime scene involving suspected homicide
where biological evidence is present?
A. Conducting autopsies and determining cause of death
B. Interviewing suspects and conducting interrogations
C. Collecting, preserving, and documenting physical evidence
D. Prosecuting criminal cases in court
Answer: C
Rationale: Forensic science technicians are responsible for
systematically collecting, preserving, and documenting physical
, evidence to maintain its integrity for laboratory analysis and legal
proceedings.
2. When collecting blood evidence at a crime scene, which method
ensures minimal contamination and preservation of DNA integrity?
A. Using bare hands to avoid chemical interference
B. Allowing the blood to air dry before packaging
C. Immediately sealing wet samples in plastic bags
D. Mixing samples from multiple locations
Answer: B
Rationale: Air drying prevents bacterial growth and degradation of
DNA, ensuring the sample remains viable for analysis while avoiding
contamination.
3. Which principle states that every contact between two objects results
in a transfer of material?
A. Newton’s Third Law
B. Locard’s Exchange Principle
C. Chain of Custody Doctrine
D. Frye Standard
Answer: B
Rationale: Locard’s Exchange Principle is fundamental in forensic
science, emphasizing that perpetrators both leave and take trace
evidence during a crime.
,4. In fingerprint analysis, which type of fingerprint pattern is
characterized by ridges entering from one side and exiting the same
side?
A. Loop
B. Whorl
C. Arch
D. Composite
Answer: A
Rationale: Loop patterns have ridges that enter from one side, curve,
and exit on the same side, making them the most common
fingerprint type.
5. Which method is most appropriate for visualizing latent fingerprints
on non-porous surfaces such as glass?
A. Ninhydrin application
B. Iodine fuming
C. Powder dusting
D. Silver nitrate solution
Answer: C
Rationale: Powder dusting adheres to the oils and residues in latent
prints on smooth, non-porous surfaces, making them visible.
6. What is the primary purpose of maintaining a chain of custody for
evidence?
A. To ensure evidence is stored in a secure location
, B. To establish ownership of evidence
C. To document the handling and integrity of evidence
D. To allow public access to evidence
Answer: C
Rationale: Chain of custody ensures that evidence has been properly
handled and remains untampered, which is critical for admissibility in
court.
7. Which type of evidence is considered class evidence rather than
individual evidence?
A. DNA profile
B. Fingerprint
C. Blood type
D. Tool mark with unique characteristics
Answer: C
Rationale: Blood type can only categorize individuals into groups and
cannot uniquely identify a single person, making it class evidence.
8. During crime scene documentation, which method provides the most
comprehensive and permanent record?
A. Verbal descriptions only
B. Sketches alone
C. Photographs and video recordings
D. Memory recall after leaving the scene
Answer: C
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. In forensic investigations, which primary role does a forensic science
technician perform at a crime scene involving suspected homicide
where biological evidence is present?
A. Conducting autopsies and determining cause of death
B. Interviewing suspects and conducting interrogations
C. Collecting, preserving, and documenting physical evidence
D. Prosecuting criminal cases in court
Answer: C
Rationale: Forensic science technicians are responsible for
systematically collecting, preserving, and documenting physical
, evidence to maintain its integrity for laboratory analysis and legal
proceedings.
2. When collecting blood evidence at a crime scene, which method
ensures minimal contamination and preservation of DNA integrity?
A. Using bare hands to avoid chemical interference
B. Allowing the blood to air dry before packaging
C. Immediately sealing wet samples in plastic bags
D. Mixing samples from multiple locations
Answer: B
Rationale: Air drying prevents bacterial growth and degradation of
DNA, ensuring the sample remains viable for analysis while avoiding
contamination.
3. Which principle states that every contact between two objects results
in a transfer of material?
A. Newton’s Third Law
B. Locard’s Exchange Principle
C. Chain of Custody Doctrine
D. Frye Standard
Answer: B
Rationale: Locard’s Exchange Principle is fundamental in forensic
science, emphasizing that perpetrators both leave and take trace
evidence during a crime.
,4. In fingerprint analysis, which type of fingerprint pattern is
characterized by ridges entering from one side and exiting the same
side?
A. Loop
B. Whorl
C. Arch
D. Composite
Answer: A
Rationale: Loop patterns have ridges that enter from one side, curve,
and exit on the same side, making them the most common
fingerprint type.
5. Which method is most appropriate for visualizing latent fingerprints
on non-porous surfaces such as glass?
A. Ninhydrin application
B. Iodine fuming
C. Powder dusting
D. Silver nitrate solution
Answer: C
Rationale: Powder dusting adheres to the oils and residues in latent
prints on smooth, non-porous surfaces, making them visible.
6. What is the primary purpose of maintaining a chain of custody for
evidence?
A. To ensure evidence is stored in a secure location
, B. To establish ownership of evidence
C. To document the handling and integrity of evidence
D. To allow public access to evidence
Answer: C
Rationale: Chain of custody ensures that evidence has been properly
handled and remains untampered, which is critical for admissibility in
court.
7. Which type of evidence is considered class evidence rather than
individual evidence?
A. DNA profile
B. Fingerprint
C. Blood type
D. Tool mark with unique characteristics
Answer: C
Rationale: Blood type can only categorize individuals into groups and
cannot uniquely identify a single person, making it class evidence.
8. During crime scene documentation, which method provides the most
comprehensive and permanent record?
A. Verbal descriptions only
B. Sketches alone
C. Photographs and video recordings
D. Memory recall after leaving the scene
Answer: C
