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Predicting the position of the source of blood stains for angled impacts on fabrics and exploring the effects of surface roughness on stain characteristics

18 January 2011

Hester Miles

The extent to which two-dimensional stain characteristics of bloodstains generated at angled impacts can be analysed to infer the precise three-dimensional drop origin characteristics was examined. Proxy blood drops were passively dropped from 4 heights (50cm, 100cm, 150cm, 200cm) to impact onto two different clothing items at 6 different impact angles (22.7o, 43.5o, 56.3o, 61.6o, 78.8o, 90o) (Knock. Davison. 2007).
Clothing differed in terms of fabric composition and surface roughness. Stains generated were then analysed to obtain measurements of main stain width, length and number of satellite stains generated. Relationships were observed between drop height and stain characteristics, and impact angle and stain characteristics.

Differences in fabric composition had a significant influence on surface roughness of the two clothing items, and this was observed to have a significant effect on morphology and characteristics of stains generated on each item. Conclusions made contribute to the potential future forensic analysis of bloodstains on fabric items.