Final answer:
The statement about the buffy coat being made up of blood's proteins is false; the buffy coat consists of white blood cells and platelets. Advanced serological testing or DNA analysis, not a perception test, is used to determine if a blood stain is of human or animal origin.
Step-by-step explanation:
The statement regarding the buffy coat is false. The buffy coat is the fraction of an anticoagulated blood sample that contains most of the white blood cells (leukocytes) and platelets following density gradient centrifugation, not the blood's proteins. Blood proteins are primarily found in the plasma, the liquid component of the blood. The buffy coat is a thin layer that is typically visible after centrifugation of the blood sample, lying between the denser red blood cells (erythrocytes) at the bottom and the plasma on top.
In regards to the question about the perception test, it is not the standard test used to determine whether a blood stain is of human or animal origin. In forensic science, more advanced techniques like serological testing or DNA analysis are used for this purpose.
One standard test that could be used to determine the origin of a blood stain is the precipitin test. This test involves the use of anti-human sera that reacts with human blood but not with animal blood, differentiating between them.