Physical Evidence & Chain of Custody Flashcards
7 cards from real DEA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Physical Evidence & Chain of Custody flashcards as text
Which analytical technique is considered the 'gold standard' for definitive drug identification in DEA forensic labs, providing both molecular structure confirmation and quantitative results?
Answer: Gas Chromatography-Mass Spectrometry (GC-MS)
GC-MS is the gold standard for drug identification because it separates compounds and identifies their molecular structure with high specificity and quantitative accuracy.
A drug seizure occurs near an international border and involves a foreign national. Which additional documentation concern applies to the physical evidence in this scenario?
Answer: Chain of custody must comply with both U.S. federal rules and any applicable mutual legal assistance treaty (MLAT) requirements
International cases may require chain of custody documentation that satisfies MLAT requirements so evidence remains admissible in both U.S. and foreign proceedings.
A court orders the destruction of a drug exhibit after all appeals are exhausted. Which DEA form documents the official destruction of controlled substances?
Answer: DEA Form 41
DEA Form 41 (Registrant Record of Controlled Substances Destroyed) documents the official destruction of controlled substance evidence.
During evidence vault inspection, an auditor finds that 50 grams of a 500-gram cocaine exhibit are unaccounted for. Aside from theft, what is another possible explanation that chain of custody records might reveal?
Answer: Authorized sampling for lab analysis not reflected in updated custody records
Lab sampling removes portions of evidence; if custody records were not updated to reflect the removed sample weight, a discrepancy will appear during audit.
Which principle requires that evidence collection, packaging, and storage conditions replicate or preserve the original state of the seized substance as closely as possible?
Answer: Preservation of integrity standard
The preservation of integrity standard requires that evidence be handled in ways that maintain its original condition for accurate analysis and legal admissibility.
A federal grand jury subpoenas a drug exhibit currently stored in a DEA evidence vault. What is the correct procedure for producing the evidence?
Answer: The case agent transports the exhibit under chain of custody documentation, signs it over to the AUSA, and receives a signed receipt
Grand jury production requires transporting the exhibit with full chain of custody documentation and obtaining a signed receipt from the AUSA who accepts custody.
An informant who participated in a controlled buy later recants and claims the drugs were planted. Which chain of custody record element BEST refutes this allegation?
Answer: Contemporaneous photographic documentation of the purchase, time-stamped transfer receipts, and unbroken seal records from buy to vault
Contemporaneous photos, time-stamped transfer receipts, and unbroken seals create an objective, time-sequenced record that demonstrates the evidence was never tampered with.