Blood Pattern Analysis (with Complete Solutions)

BPA correct answers Bloodstain Pattern Analysis. -Investigators can learn from the analysis of a blood -Type/velocity, number of blows, handedness of assistant, position/movements of the victim, which wounds were inflicted first, types of injuries, how long ago the crime was committed, whether death was immediate or delayed. Spatter correct answers Bloodstains created from the application of force to the area where the blood originated. Origin/Source correct answers The place from where the blood spatter came from or originated. Angle of Impact correct answers The angle at which a blood droplet strikes a surface. Parent Drop correct answers The droplet from which a satellite spatter originates. Satellite Spatters correct answers Small drops of blood that break off from the parent spatter when the blood droplet hits a surface. Spines correct answers The pointed edges of a stain that radiate out form the spatter; can help determine the direction from which the blood trailed. Physical Examination & Light Source correct answers Investigators will first examine the crime scene to look for areas that may contain blood. They may also use a high-intensity light or UV lights to help them find traces of blood as well as others bodily fluids that are not visible under normal lighting conditions. Blood Reagent Tests (Called presumptive tests) correct answers These tests are used to detect blood at crime scenes based upon the properties of hemoglobin in the blood. Further tests at the crime lab can determine if it is juan blood or not. The Kastle-Meyer tests use phenolphthalein and hydrogen peroxide, while HemaStix is a paper strip coated with TMB. Luminol correct answers This chemical is used to locate traces of blood, even if it has been cleaned or removed. Investigators spray a luminol solution throughout the area under investigation and look for reactions with the iron present in blood, which causes a blue luminescence. Fluorescein correct answers This chemical is also capable of detecting latent or old blood. However, a special light and goggles are used to detect any illuminated areas, which appear greenish-white if blood is present. It may also react to many of the same things as luminol (copper and bleach). LCV or Leuco Crystal Violet correct answers One type of chemical process that is used for blood enhancement to make the blood evidence more visible so it can be photographed and analyzed. Passive Bloodstains correct answers Patterns created from the force of gravity; can be a single drop, a series of drops, flow patterns, blood pools, etc.