Since 1985 and the work of Sir Alec Jeffreys, we have the opportunity to identify the source of blood through its DNA. If it is now possible to identify the blood, it remains crucial to identify the action that caused the deposition of this blood on the support studied, to be able to link it to the current investigation.
As soon as a blood vessel is injured, the blood moves out of the circulatory system according to the laws of physics. If a wound exists, the blood goes outside, and the bloodstains are created on the surrounding supports, according to various interactions of which the most common are:
• gravity (flow, …);
• the source-specific force exerting pressure on the liquid blood (cardiac pressure, exhalation, …);
• a force external to the source of blood (violent action, …);
• a force related to the movement of a bloody element (hand, hair, weapon, …);
• transfer by contact between two surfaces, at least one of which is bloody (transfer by contact, alteration by contact, transfer slipped, alteration slipped).
Named BLOODSTAIN PATTERN ANALYSIS this forensic Science determines the events at the origin of the
Thus, the study of the shapes, sizes, distributions and dispersions of bloodstains, provides information such
This information is finally used to reconstruct the dynamics of the bloody events and if necessary, later compared to the statements of witnesses and suspects of these facts.
Previously, the medical examiner interpreted the bloodstains, alone, and without training, according to what he saw at the Crime Scene and during the autopsy (see the works mainly from
The presence of the Bloodstain Pattern Expert the reconstitution done by the magistrate can also be useful or even essential to verify the compatibility of the testimonies but also to facilitate the work of synthesis of the various expertise with the initial findings.
Forensic Expert of the French Supreme Court
Bloodstain Pattern Analysis Expert of the Internation Criminal Court
IAI BPA Certification
Founder of the BPA
International Association of Bloodstain