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.
For example, collecting DNA evidence from a crime scene might prove that an individual was at the crime scene, at some point, but it would not prove that he or she committed the crime, or even necessarily that he or she was at the crime scene at the time of the crime.