Additionally, the detectives saw signs of someone having washed and cleaned up the tub, which still had blood residue.

DNA is prepared from the blood residue and is the DNA source for the analysis.

Instead there are tools used to cut meat off the bone, as there is blood residue left on the stone tools.

Modern forensic techniques permitted a wealth of analyses to be performed on the limited blood residue that was recovered.

But they were surprised to learn that the DNA of two individuals was discovered in the blood residue on the knife.

The corresponding areas of JonBenet's crotch, however, bore no matching blood residue.

Crime scenes are normally carefully searched for blood residue.

The standard documentation of blood residue includes photographs and descriptions of form, color, size and position of each stain found.

Overall photographs and sketches are also produced to show the relationship of the blood residue to other elements of the scene and to enable pattern analysis.

Evidence of organic material has also been recovered from blood residue on hunting tools that archaeologists have identified as caribou.