However, in resting horses, a heart rate over 80 can be a sign of a serious problem. If a calm horse has a pulse that is consistently over 60, it can also be a problem. Things that can increase the horse's heart rate include exercise, fear, pain, stress, and excitement.
Because blood analysis is a comparison analysis (comparison of the victim's blood and the suspect's blood to blood found at the crime scene), reference blood samples are needed from the victim and suspect. A comparison must be made between the genetic markers in the victim s blood and the suspect's blood.
Physical evidence can, therefore, be a highly significant part of a crime investigation. However, to play its role, the evidence must be collected and analyzed properly. In the case of a serious crime, every possible item of physical evidence must be collected. As some evidence is trace evidence, this means an extremely thorough search, or fingertip search, of the scene is conducted.