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| Name | Bloodstain Pattern Analysis Black Box Study |
| Video Uploader | Video From CSAFE forensicstats |
| Upload Date | This Video Uploaded At 15-10-2021 16:08:03 |
| Video Discription | This study was conducted to assess the accuracy and reproducibility of BPA conclusions. Although the analysis of bloodstain pattern evidence left at crime scenes relies on the expert opinions of bloodstain pattern analysts, the accuracy and reproducibility of these conclusions have never been rigorously evaluated at a large scale. We investigated conclusions made by 75 practicing bloodstain pattern analysts on 192 bloodstain patterns selected to be broadly representative of operational casework, resulting in 33,005 responses to prompts and 1,760 short text responses. Our results show that conclusions were often erroneous and often contradicted other analysts. On samples with known causes, 11.2% of responses were erroneous. The results show limited reproducibility of conclusions: 7.8% of responses contradicted other analysts. The disagreements with respect to the meaning and usage of BPA terminology and classifications suggest a need for improved standards. Both semantic differences and contradictory interpretations contributed to errors and disagreements, which could have serious implications if they occurred in casework. Paul Kish, Kevin Winer, and Noblis conducted the study under a grant from the U.S. National Institute of Justice (NIJ). Chapters: 0:00 Introduction 0:49 Presentation 40:23 Q&A Session 56:08 Closing w6wXdzvXSJg |
| Category | Science & Technology |
| Tags | blood | blood stain | blood stain pattern | blood stain pattern analysis | bloodstain | bloodstain pattern | bloodstain pattern analysis | bpa | csafe | forensic | forensic science | forensics | forensicstats | nist | webinar |
