Yapp v. Union Pacific R. Co.

**What Happened** Railroad workers sued Union Pacific Railroad Company claiming discrimination. During the court case, the company tried to use expert reports to defend itself. The workers' lawyers asked the court to throw out these expert reports, arguing they were unreliable and shouldn't be allowed as evidence. **What the Court Decided** The court made a split decision. It rejected some of Union Pacific's expert evidence but allowed other parts to be used. Specifically, the court found that a survey methodology called the "Ward and Woods survey" was scientifically flawed and couldn't be presented to a jury. However, the court allowed the company to use statistical analysis based on combined data, though with some restrictions on how it could be presented. **Why This Matters for Workers** This ruling shows that courts will carefully examine the quality of evidence that employers try to use in discrimination cases. When companies present expert testimony or surveys to defend against discrimination claims, that evidence must meet strict scientific standards. Workers can challenge questionable expert evidence, and courts will throw out studies or analyses that don't meet proper scientific methods. This helps ensure that only reliable, credible evidence is considered when determining whether discrimination occurred.