CJ 421 Lecture 13: CJ 421 Notes 02-17-2017
29 Mar 2017
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Of watermelons and blood: splatter, spatter, and stains. Last time we looked at serology and we focused on. Leading fluids and what they can tell us. Today we move from serology and what is in blood in particular to how blood behaves. What they tell us about a crime. Low = 0-5 ft. /sec. (essentially dripping blood) Medium = 5-100 ft/sec (you"re injured and you"re struggling) High = 100+ ft/sec (gunshots, blunt force such as pushed into an airplane propeller, wood chipper, machinery, and sometimes car accidents) This will impact the type of stain we get and will let us know something about how the injury or killing happened. Passive stains = standard dripping blood (dripping under gravity; gravity is the only thing acting on it essentially) Active stains = active because it has some additional energy added to it or because we"re running away or because our blood is under a heartbeat.
