When a crime scene ifivolves blood, you know it's bad. ! Someone may be hurt or dead, and figuring / infographics :: blood

blood infographics 
When a crime scene ifivolves blood, you know it's bad. ! Someone may be hurt or dead, and figuring out who and why becomes urgent. Thats why law enforcement officials call upon experts in bloodstain pattern analysis, or BPA, to determine what happened as quickly as possible. Every drop of blood
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When a crime scene ifivolves blood, you know it's bad. ! Someone may be hurt or dead, and figuring out who and why becomes urgent. That’s why law enforcement officials call upon experts in bloodstain pattern analysis, or BPA, to determine what happened as quickly as possible. Every drop of blood tells a story- what may surprise you is these stories' amazing depth of detail. In the human body, blood accounts for roughly 8* of body weight. THE TYPES OF SPATTER IMPACT SPATTERS MEDIUM-VELOCITY FORCE OF IMPACT: 5-100 fps DROPLET DIAMETER: less than 4mm ------ POSSIBLE SOURCE: blunt object, fist, stabbing, artery spray LOW-VELOCITY FORCE OF IMPACT: 5 feet per second (fps) or less DROPLET DIAMETER: 4-8mm POSSIBLE SOURCE: dripping blood, “passive spatters" HIGH-VELOCITY FORCE OF IMPACT: >100fps DIAMETER: less than 1mm POSSIBLE SOURCE: gunshot wounds OTHER BLOODSTAIN PATTERNS fig-1 fig 2 6g.3 CAST-OFF STAINS SHADOWING/ GHOSTING SWIPES AND WIPES When blood on an object that 1s swung through space flies off onto a surface. When there is an empty space, or “void" in spatter, indicating that an object blocked spray. Swipes occur when blood on a surface 1s smeared, and wipes occur when a bloody object brushes against a surface. fig-4 EXPIRATORY BLOOD Blood that is coughed up or breathed out. Misty pattern resembling high-velocity spatter results. TRANSFER PATTERN The bloodstain pattern left on a surface after a bloody object has been placed on it. ANALYZING THE PATH OF A BLOOD DROPLET After determining the type of spatter and weapon likely used, forensic analysts look at the shape of individual droplets to mathematically determine their point of origin. fig-1 Though blood droplets form at the edge of a surface as teardrops, they travel as spheres. fig 2 The diameter of a blood stain increases with the height from which it was dropped. • • • # 6 1n 1 ft 2 ft 3 ft ■m mm m 4 ft 5 ft 6 ft 7 ft CALCULATING THE IMPACT ANGLE The shape of a droplet also changes with the angle at which it strikes the surface. The sharper the angle, the longer the tail. Analysts can use the dimensions of the droplet to determine the angle at which it hit the surface by dividing its width by its length, then taking the arcsin of that number: О о ANGLE OF IMPACT = ARCSIN WIDTH LENGTH If no victim is present, forensic analysts can use the information gathered from BPA to assess what kinds of wounds may have been dealt: fig-1 INCISIONS Thin wound caused by a sharp-edged object such as a knife. Spatter: Low-velocity, wipe fig-4 GUNSHOT WOUNDS Caused by a bullet or other high-velocity projectile entering the skin. May result in two wounds (entry and exit). Spatter: High-velocity fig 2 LACERATIONS Tear wounds caused by blunt trauma. Spatter: Low- or medium-velocity ABRASIONS Scrapes caused by sliding against a rough surface. Spatter: Wipes *3 PENETRATION WOUNDS Occur when a sharp object is inserted and pulled out of the skin. Spatter: Low- and medium-velocity PUNCTURE WOUNDS Caused by a thin, pointy object puncturing the skin. Spatter: Low-velocity, wipe CREATED BY FORENSICNURSING.ORG REFERENCES: « http://www.sho.com/si te/dexter/blood_spatter.do http://science.howstuffworks.com/bloodstain-pattern-analysisj; http://www.bloodspatter.com/BPATutorial.htm • . * http://projects.nfstc.org/gallery/main.php7s2_itemId-38S7. http://en.wikipedia.org a». . I- ative Commons
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RJ IIIIVI L.U I iiiiwwwm - --------------im(I Ilia Piiiiisliiiwnts that Canw uiitli Timin'lINfi.being sTamleraus and ruk a public nuisance.Ancient inuiaPenalty. DeathUnder He Two code, seeding one's parertColonial |ImcncaPenalty: the Ducking Stoolpenalty''ihe Dueling StoolPenalty: Misdemeanor
this blood lamp doesn't look that bloody bu the way ou turn it on can be considerd gruesome
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this blood lamp doesn't look that bloody bu the way ou turn it on can be considerd gruesome
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