Note: At the 2009 IABPA meeting in Portland, OR, USA, the IABPA membership voted to adopt the SWGSTAIN recommended terminology.
Definition
- Passive Drop
- Bloodstain drop(s) created or formed by the force of gravity acting alone.
Bloodstain Example - Passive Drop
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Description
This pattern was generated by allowing blood to drip off the tip of a finger approximately 45 cm above the target. The finger was moved slightly between each drop.
When the blood drop (a sphere) strikes a flat target (a plane) the shape formed on the surface by the blood drop is an ellipse. In cases where the impact angle is 90° the ellipse has the same major and minor axes length which is a circle. Passive drops will vary in shape and size depending on the volume of blood and the surface texture, but will generally be circular.
Alternate Terminology
| Bevel & Gardner | Spatter Family - Non-linear - Drip |
| James, Kish & Sutton | Passive - Contact/Transfer - Drop - Single |
| Wonder | Spatter Groups - Cast-offs - Drip (Passive) |
| SWGSTAIN | Closest to Drip Stain - A bloodstain resulting from a falling drop that formed due to gravity. |