The interpretation of bloodstains at a scene, using pattern recognition and the physics of droplet flight to reconstruct the events that produced them. Herbert Leon MacDonell formalized the field with his 1971 study of the flight characteristics of human blood and taught its first formal course in 1973, and its scientific standing has since been seriously challenged. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
Facts
Disputed
Known LimitationFollowing Daubert-standard admissibility challenges, courts have divided on whether bloodstain pattern analysis testimony meets reliability requirements: some courts have limited or excluded expert testimony on specific claims, while others continue to admit it when performed by analysts trained to established protocols. 2 Following Daubert-standard admissibility challenges, courts have divided on whether bloodstain pattern analysis testimony meets reliability requirements: some courts have limited or excluded expert testimony on specific claims, while others continue to admit it when performed by analysts trained to established protocols. What It ExaminesSourced to the subject's own accountThe size, shape, distribution and location of bloodstains, read for the actions and positions that could have produced them. 1 Formalized YearSourced to the subject's own accountThe year of MacDonell's Flight Characteristics and Stain Patterns of Human Blood. Known LimitationThe 2009 National Academy of Sciences report concluded that the uncertainties associated with bloodstain pattern analysis are enormous and that expert opinions in the field were generally more subjective than scientific. 2 Discipline
Discipline (category)Sourced to the subject's own account Connections
Associated With
Bloodstain pattern analysis is one of the physical evidence disciplines crime scene reconstruction draws on directly.
Source Wikipedia: Crime Reconstruction
Examines Within
Pioneered By
Herbert MacDonell is widely called the father of modern bloodstain pattern analysis in the United States, publishing its foundational research and training generations of investigators from the 1970s onward.
Sources
1. Wikipedia: Bloodstain Pattern Analysis
In Group: Criminalistics Foundations and Pattern Evidence, Lead sentenceQuote, In Group: Criminalistics Foundations and Pattern Evidence, Lead sentence
Bloodstain pattern analysis (BPA) is a forensic discipline focused on analyzing bloodstains left at known, or suspected crime scenes through visual pattern recognition and physics-based assessments.
2. Strengthening Forensic Science in the United States: A Path Forward
Quote
The uncertainties associated with bloodstain pattern analysis are enormous.
Wikipedia: Crime Reconstruction
Dissenting Readings (1 dissenting reading)
Known Limitation
Bloodstain pattern analysis practitioners and certifying bodies maintain that the discipline rests on established physics of fluid dynamics and that analysts trained and tested to IABPA and SWGSTAIN protocols produce reliable, court-admissible conclusions; they argue the 2009 NAS critique targeted a lack of published statistical validation studies rather than the method's underlying physical principles, and point to post-Daubert rulings that have continued to admit qualified BPA testimony.
A dissenting reading, from International Association of Bloodstain Pattern AnalystsStrengthening Forensic Science in the United States: A Path Forward
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