Reliability Assessment of Current Methods in Bloodstain Pattern Analysis (ojp.gov)Excerpt: "Study results showed that where a scenario was offered that deliberately pointed analysts towards the correct classification, the proportion of misclassifications that resulted was significantly lower (8% rigid surfaces, 14% fabric surfaces) than that observed for patterns with neutral scenarios (11% rigid surfaces, 26% fabric surfaces). This is an example of the well known phenomenon of confirmation bias. here a scenario was offered that deliberately pointed analysts towards an incorrect classification, the proportion of misclassifications that resulted was significantly higher (20% rigid surfaces, 30% fabric surfaces) than that observed for patterns with neutral scenarios (11% rigid surfaces, 26% fabric surfaces)."