A review technique: when a claim or label is cited (e.g., "that was fraud"), keep asking how it was actually determined until you reach the real source of truth — or an admitted gap in the data. It surfaces unverified assumptions baked into metrics and labels before they're treated as fact.
When a metric or label comes up in a review, ask how it's generated or labeled, and keep asking "how do you know that?" until you hit either the actual source of truth or a confessed unknown.