Rule 403
The rule allowing relevant evidence to be excluded when unfair prejudice, confusion, delay, or waste substantially outweighs its value.
Governing rule: Fed. R. Evid. 403
Plain-English definition
Rule 403 is the judge’s balancing tool. Evidence can be relevant and still excluded if its dangers substantially outweigh its probative value. The classic fight is whether vivid or inflammatory evidence helps prove a real point or merely pushes the jury toward emotion.
How it works
Rule 403 arguments often appear in motions in limine and trial objections. Courts balance probative value against unfair prejudice, confusion, misleading the jury, delay, wasting time, or cumulative proof.
Why it matters
Rule 403 shapes what the jury actually sees. It can keep a trial focused on proof instead of spectacle.