Evidence Collection and Preservation Flashcards
6 cards from real ABMDI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Evidence Collection and Preservation flashcards as text
Which of the following is the best approach for collecting a hair sample for DNA analysis from a decedent?
Answer: Pull hair with the root intact from the scalp, as the root contains nuclear DNA
Nuclear DNA is found in the hair root (follicle). Hairs must be pulled, not cut, to ensure root material is included for nuclear DNA analysis.
Sexual assault evidence collected at a medicolegal autopsy should be preserved by:
Answer: Air-drying swabs before packaging, storing separately in labeled paper envelopes at room temperature or refrigeration
Sexual assault swabs must be air-dried before packaging in paper to prevent degradation of biological material, then stored refrigerated or at room temperature depending on the lab protocol.
When collecting a urine sample for toxicology from a decedent at autopsy, what is the preferred collection method?
Answer: Aspirate urine directly from the bladder with a syringe
Urine is collected by direct needle aspiration from the bladder during autopsy, which is the most controlled and contamination-free method.
A death scene includes a computer that may contain relevant communications. The MDI's appropriate action is to:
Answer: Leave the computer for law enforcement to handle under proper digital evidence protocols
Digital evidence requires specialized handling by law enforcement or digital forensics experts under proper legal authority. MDIs should not access digital devices at the scene.
What is the purpose of applying a tamper-evident seal on evidence packages?
Answer: To visually confirm whether the package has been opened after sealing
Tamper-evident seals provide visual confirmation of whether an evidence package was opened after sealing, helping maintain and document chain of custody integrity.
At a fire-related death scene, what special consideration applies to evidence collection?
Answer: Accelerant samples should be collected in clean, airtight metal or glass containers to prevent evaporation
Accelerant evidence (suspected arson) must be collected in airtight metal paint cans or glass containers to prevent evaporation of volatile compounds before laboratory analysis.