The four types of passive bloodstains are drip patterns, contact patterns, drip trails, and blood pools or blood clots.
Bloodstain may be defined as the property of blood that arises due to discoloration caused by it.
Blood stains typically emerge due to the force of gravity acting upon them.
Drip pattern is formed when a finger or any body part is injured or cut by a knife. Contact pattern fomed when an injured body part has in continuous contact with other body parts or objects.
Blood clots may arise due to sudden damage but blood is not reaching the outside of the body. It creates a clot near the surface of the outer layer of skin.
Therefore, it is well described above.
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