The document summarizes a study that investigated the effect of judicial instructions to disregard inadmissible evidence presented in a mock trial. Specifically, it examined how juror credibility ratings of witnesses and verdicts were impacted when judges provided legal explanations for their instructions to ignore evidence versus no explanation. Results showed that witness credibility was the only statistically significant factor influencing juror decisions under the conditions tested. Further analysis confirmed confidence is a poor predictor of witness accuracy.