| A | B |
|---|
| Angle of impact | angle at which blood strikes a target surface. |
| Bloodstain transfer | when a bloody object comes into contact with a surface and leaves a patterned blood image on the surface |
| Backspatter | blood that is directed back toward the source of energy |
| Cast-off | blood that is thrown from an object in motion |
| Contact stain | bloodstains caused by contact between a wet blood-bearing surface and a second surface which may or may not have blood on it |
| Transfer | an image is recognizable and may be identifiable with a particular object |
| Swipe | wet blood is transferred to a surface which did not have blood on it |
| Wipe | a non-blood bearing object moves through a wet bloodstain |
| Directionality | relates to the direction a drop of blood traveled in space from its point of origin |
| Terminal velocity | the greatest speed to which a free falling drop of blood can accelerate in air. |
| High velocity | greater than 25 feet per second and gives a fine mist appearance |
| Round shape | if it falls straight down at a 90 degree angle. |
| Elliptical shape | if blood impacts a surface at an angle less than 90 degrees |
| Class evidence | would include blood type. |
| Individual evidence | would include DNA analysis |
| Circumstantial evidence | Blood stain patterns |
| Secretors | individuals whose blood-type antigens are found in high concentration in their body fluids |
