Case Analysis & Practical Application Flashcards

A forensic expert is asked to interpret a case where a pedestrian was struck by a vehicle. The victim has a bumper impact abrasion on the lower leg, a secondary impact fracture pattern on the pelvis, and a contre-coup head injury. This pattern is termed:

Answer: Waddell's triad

Waddell's triad describes the classic pattern in pedestrian-vehicle collisions: lower limb impact, trunk/thorax impact, and head injury from the secondary fall to the ground.

A defendant in a civil case claims total disability from a workplace injury. Video surveillance shows the plaintiff performing strenuous activities. The forensic physician's report should:

Answer: Document the discrepancy objectively and provide opinion on functional capacity based on all available evidence

The forensic physician must objectively reconcile all evidence, including surveillance, and provide an evidence-based opinion on functional capacity without prejudging legal conclusions.

In a suspected carbon monoxide poisoning from a faulty furnace, a 4-person household has two deaths and two survivors. The two survivors had CO-Hb levels of 18% and 22%. The two decedents had CO-Hb levels of 38% and 55%. Which factor best explains the survivors' lower levels?

Answer: The survivors received supplemental oxygen before blood draw

Administration of supplemental oxygen before blood sampling rapidly converts CO-Hb back to oxyhemoglobin in living patients, making ante-mortem samples appear falsely low compared to post-mortem levels.

A forensic pathologist determines that a 28-year-old's death was due to acute cocaine toxicity with a blood cocaine level of 0.9 mg/L and cocaethylene present. The presence of cocaethylene specifically indicates:

Answer: Concurrent alcohol ingestion at the time of cocaine use

Cocaethylene is formed exclusively in the liver when cocaine and ethanol are co-ingested simultaneously, making its presence definitive proof of concurrent alcohol use.

A forensic expert reviewing a neonaticide case must determine if the infant was born alive. Which histological finding in the lung most strongly supports live birth?

Answer: Expanded alveoli with aerated appearance and capillary engorgement

Aerated alveoli with capillary engorgement (hyperemia) on histology indicates pulmonary ventilation occurred, the gold standard for establishing live birth in neonaticide investigations.

A forensic medicine expert is evaluating a case of alleged medical malpractice where a patient died following delayed diagnosis of a pulmonary embolism. To establish causation, the expert must demonstrate:

Answer: That timely diagnosis and treatment would have more likely than not prevented death

In medical malpractice, causation requires demonstrating that the breach of standard of care was more likely than not (>50%) the proximate cause of the adverse outcome.

A forensic expert is asked to assess whether injuries on a sexual assault victim are 'consistent with' non-consensual intercourse. Which response best reflects the appropriate forensic standard?

Answer: The presence or absence of genital injury cannot confirm or exclude consensual versus non-consensual intercourse

Research consistently demonstrates that genital injury can occur with consensual sex and be absent after assault; physical findings cannot reliably distinguish consensual from non-consensual intercourse.