TEXAS EVIDENCE TECHNICIAN
CERTIFICATION EXAM – PRACTICE
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A | INSTANT DOWNLOAD PDF
1. What is the primary responsibility of an evidence technician
at a crime scene?
A. Conduct interviews with suspects
B. Analyze DNA in the lab
C. Collect, preserve, and document physical evidence
D. Make arrests
rationale: the primary role of an evidence technician is to
ensure proper collection, preservation, and documentation of
evidence to maintain the integrity of the investigation.
2. Which of the following is a critical step when photographing
a crime scene?
A. Using only natural light
B. Avoiding wide-angle shots
C. Capturing the scene from multiple angles including close-
ups and overviews
D. Only photographing the evidence itself
rationale: photographing from multiple angles and distances
,ensures a comprehensive visual record for investigation and
court presentation.
3. What is the main reason for using gloves when handling
evidence?
A. To prevent fingerprints from being left by the technician
B. To prevent contamination of evidence
C. To look professional
D. To prevent injuries from sharp objects
rationale: gloves are essential to prevent contamination,
preserve the integrity of evidence, and avoid cross-
contamination between items.
4. Which type of evidence can degrade quickly if not properly
preserved?
A. Metal objects
B. Biological samples such as blood or saliva
C. Plastic materials
D. Documents
rationale: biological evidence is prone to decomposition,
bacterial growth, and environmental damage, requiring
immediate and proper preservation.
5. When collecting trace evidence, what is the most effective
method?
,A. Handpicking with fingers
B. Using tweezers, tape lifts, or vacuum devices
C. Throwing it into a plastic bag
D. Using a magnet
rationale: trace evidence is often microscopic and delicate;
using specialized tools prevents loss and contamination.
6. Chain of custody documentation is important because:
A. It tracks the ownership of the evidence
B. It ensures evidence integrity and accountability from
collection to courtroom
C. It lists all the evidence collected
D. It provides a timeline of the crime
rationale: proper chain of custody is legally required to
demonstrate that evidence has not been altered or tampered
with.
7. What is the proper way to store blood evidence for
analysis?
A. At room temperature in a plastic bag
B. In a sealed plastic container in sunlight
C. Refrigerated or frozen in a breathable container
D. Submerged in water
rationale: blood must be stored in breathable containers and
refrigerated or frozen to prevent degradation and bacterial
growth.
, 8. Which of the following is an example of physical evidence?
A. Eyewitness testimony
B. Confession
C. A bullet recovered from a crime scene
D. Surveillance video
rationale: physical evidence is tangible material that can be
examined scientifically, like bullets, weapons, or clothing.
9. Before collecting evidence, a technician should:
A. Start collecting immediately to avoid contamination
B. Assess the scene and document its initial condition
C. Only collect what is most visible
D. Remove all objects from the scene for analysis
rationale: documenting the scene before collection preserves
context and ensures evidence is properly cataloged.
10. What is the main purpose of using evidence packaging like
paper bags instead of plastic?
A. Plastic is more expensive
B. Paper allows biological evidence to breathe, preventing
mold and degradation
C. Paper is more visually professional
D. Plastic makes it difficult to open in court
rationale: paper bags prevent moisture accumulation and
degradation of biological evidence, which can occur in sealed
plastic containers.
CERTIFICATION EXAM – PRACTICE
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A | INSTANT DOWNLOAD PDF
1. What is the primary responsibility of an evidence technician
at a crime scene?
A. Conduct interviews with suspects
B. Analyze DNA in the lab
C. Collect, preserve, and document physical evidence
D. Make arrests
rationale: the primary role of an evidence technician is to
ensure proper collection, preservation, and documentation of
evidence to maintain the integrity of the investigation.
2. Which of the following is a critical step when photographing
a crime scene?
A. Using only natural light
B. Avoiding wide-angle shots
C. Capturing the scene from multiple angles including close-
ups and overviews
D. Only photographing the evidence itself
rationale: photographing from multiple angles and distances
,ensures a comprehensive visual record for investigation and
court presentation.
3. What is the main reason for using gloves when handling
evidence?
A. To prevent fingerprints from being left by the technician
B. To prevent contamination of evidence
C. To look professional
D. To prevent injuries from sharp objects
rationale: gloves are essential to prevent contamination,
preserve the integrity of evidence, and avoid cross-
contamination between items.
4. Which type of evidence can degrade quickly if not properly
preserved?
A. Metal objects
B. Biological samples such as blood or saliva
C. Plastic materials
D. Documents
rationale: biological evidence is prone to decomposition,
bacterial growth, and environmental damage, requiring
immediate and proper preservation.
5. When collecting trace evidence, what is the most effective
method?
,A. Handpicking with fingers
B. Using tweezers, tape lifts, or vacuum devices
C. Throwing it into a plastic bag
D. Using a magnet
rationale: trace evidence is often microscopic and delicate;
using specialized tools prevents loss and contamination.
6. Chain of custody documentation is important because:
A. It tracks the ownership of the evidence
B. It ensures evidence integrity and accountability from
collection to courtroom
C. It lists all the evidence collected
D. It provides a timeline of the crime
rationale: proper chain of custody is legally required to
demonstrate that evidence has not been altered or tampered
with.
7. What is the proper way to store blood evidence for
analysis?
A. At room temperature in a plastic bag
B. In a sealed plastic container in sunlight
C. Refrigerated or frozen in a breathable container
D. Submerged in water
rationale: blood must be stored in breathable containers and
refrigerated or frozen to prevent degradation and bacterial
growth.
, 8. Which of the following is an example of physical evidence?
A. Eyewitness testimony
B. Confession
C. A bullet recovered from a crime scene
D. Surveillance video
rationale: physical evidence is tangible material that can be
examined scientifically, like bullets, weapons, or clothing.
9. Before collecting evidence, a technician should:
A. Start collecting immediately to avoid contamination
B. Assess the scene and document its initial condition
C. Only collect what is most visible
D. Remove all objects from the scene for analysis
rationale: documenting the scene before collection preserves
context and ensures evidence is properly cataloged.
10. What is the main purpose of using evidence packaging like
paper bags instead of plastic?
A. Plastic is more expensive
B. Paper allows biological evidence to breathe, preventing
mold and degradation
C. Paper is more visually professional
D. Plastic makes it difficult to open in court
rationale: paper bags prevent moisture accumulation and
degradation of biological evidence, which can occur in sealed
plastic containers.
