Simply Forensic · Case-based learning · Advanced

Trace Evidence Challenge: Transfer, Comparison and Context

Twelve applied questions based on simulated glass, paint and fiber comparisons. Assess refractive-index evidence, material associations, contamination, transfer and activity-level reasoning.

Illustrative forensic fiber comparison photograph from Simply Forensic, not actual specimens G1, F1 or P1 — Illustrative site-library image only. All measurements and evidence identifiers below are simulated for training.

Question 1 of 12Score: 0

Open the simulated trace-evidence comparison exhibit

Fictional scenario: Trace materials are recovered after a disputed workshop contact. The table provides all observed measurements and classifications; conclusions must account for possible prior exposure and contamination. This is not casework data.

Shoe-sole glass

Refractive index 1.5202 ± 0.0002; no physical fit tested.

Window reference glass

Refractive index 1.5201 ± 0.0002.

P1 / P2

Questioned / reference paint

Both show three visually similar layers; no proven physical fit.

F1 / F2

Questioned / reference fibers

Both blue polyester with comparable microscopic appearance.

Comparison note: The refractive-index values differ by 0.0001. Separate ±0.0002 measurement uncertainties were stipulated for the exercise. For question 9 only, likelihoods are fictional teaching values, not outputs of trace-evidence statistics.

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