Criminal Justice & Law Enforcement: Blood Spatter

Organization of Scientific Area Committees (OSAC) for Forensic Science

Lists publications including official OSAC registered standards.

PUBLISHED STANDARD ON THE OSAC REGISTRY (ADDED JUNE 3, 2020).

Draft OSAC Proposed Standard 2022

Forensic Science International
Volume 325, August 2021, 110856
Highlights
•Conclusions by bloodstain pattern analysts were often erroneous and often contradicted other analysts.
•On samples with known causes, 11.2% of responses were erroneous.
•Both semantic differences and contradictory interpretations contributed to errors and disagreements.

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)."

Excerpt: "This is a data set of 61 blood spatter patterns scanned at high resolution, generated by controlled impact events corresponding to forensic beating situations. "

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