DEA Physical Evidence & Chain of Custody 3 — Questions and Answers
Question 1: A large drug shipment is seized at a port of entry. Which sampling method is DEA-approved to statistically represent the entire shipment without testing every package?
- Random convenience sampling
- Stratified random sampling per DEA guidelines (Correct answer)
- Testing only the top layer of packages
- Testing the smallest and largest packages only
Correct answer: Stratified random sampling per DEA guidelines
DEA guidelines specify stratified random sampling protocols to ensure the tested sample statistically represents the entire seized shipment.
Question 2: When seizing digital evidence such as a drug trafficker's smartphone, what is the primary concern regarding evidence integrity?
- Battery life
- Remote wipe capability and signal isolation (Correct answer)
- Screen condition
- Operating system version
Correct answer: Remote wipe capability and signal isolation
Smartphones can receive remote wipe commands; agents must immediately place them in a Faraday bag to block signals and prevent data destruction.
Question 3: A drug exhibit is returned from the DEA lab with a net weight significantly different from the original field measurement. What is the most appropriate action?
- Discard the original weight from records
- Document both weights, note discrepancy, and have a supervisor review (Correct answer)
- Assume the lab made an error and re-weigh independently
- Resubmit the sample without notation
Correct answer: Document both weights, note discrepancy, and have a supervisor review
Weight discrepancies must be documented transparently, with both measurements recorded and supervisory review initiated to explain the difference.
Question 4: Which of the following actions would MOST likely compromise the chain of custody of a drug exhibit?
- Photographing the evidence before packaging
- Allowing an unauthorized person temporary access without documentation (Correct answer)
- Using tamper-evident seals
- Logging every transfer in a chain of custody form
Correct answer: Allowing an unauthorized person temporary access without documentation
Allowing undocumented access by unauthorized persons breaks the chain of custody and may render evidence inadmissible.
Question 5: In a multi-defendant drug conspiracy case, physical evidence is shared across multiple defendants' prosecution files. How should custodians handle this situation?
- Make physical copies of all drug evidence
- Maintain a single evidence log with cross-references to all case numbers (Correct answer)
- Create separate evidence packages with portions of each seized item
- Assign the evidence to the highest-priority defendant only
Correct answer: Maintain a single evidence log with cross-references to all case numbers
Evidence shared across cases is maintained as a single exhibit with cross-referenced case numbers in the custody log to avoid duplication or fragmentation.
Question 6: A DEA special agent must transport a large quantity of seized heroin across state lines to a federal evidence vault. Which requirement applies?
- No special requirement beyond standard packaging
- Two-agent transport, documented manifest, and secure vehicle (Correct answer)
- Commercial shipping with declared contents
- A federal judge's transport order
Correct answer: Two-agent transport, documented manifest, and secure vehicle
Large drug shipments require at least two agents, a documented chain of custody manifest, and a secured government vehicle to prevent diversion.
Question 7: What is the purpose of performing a 'blind' quality control check on a subset of drug evidence packages in a DEA evidence vault?
- To reduce the total volume of stored evidence
- To detect tampering, substitution, or weight discrepancies without alerting vault personnel in advance (Correct answer)
- To expedite disposal of old evidence
- To catalog evidence for trial preparation
Correct answer: To detect tampering, substitution, or weight discrepancies without alerting vault personnel in advance
Blind quality control checks detect internal tampering or errors by auditing packages without prior notification to vault staff.
DEA Physical Evidence & Chain of Custody 3
A large drug shipment is seized at a port of entry.
Which sampling method is DEA-approved to statistically represent the entire shipment without testing every package?