How Bloodstain Pattern Analysis Works If you're flipping channels one day and come upon a crime scene as depicted on one of the many TV shows that focus on forensic science, such as "CSI" or "Dexter," you might notice something strange. Among the technicians dusting for fingerprints and collecting hair fibers at the murder scene, you spot an array of red strings running from the floor, the wall, the table and the sofa. All of the strings meet at nearly the same point. Suddenly, an investigator begins recounting aspects of the crime: When it happened, where the assault took place in the room, what kind of weapon the perpetrator used and how close to the victim the assailant stood. The strings themselves aren't important. Of course, analyzing blood spatter isn't as simple as fictional bloodstain pattern analysts like Dexter Morgan make it appear. Let's start with the basics of bloodstain pattern analysis — for example, what blood spatters can reveal (and what they can't).
The History of Fingerprints Fingerprints offer a reliable means of personal identification. That is the essential explanation for fingerprints having replaced other methods of establishing the identities of persons reluctant to admit previous arrests. 1 The science of fingerprint identification 5 stands out among all other forensic sciences for many reasons, including the following: Other visible human characteristics, such as facial features, tend to change considerably with age, but fingerprints are relatively persistent. In earlier civilizations, branding or maiming were used to mark persons as criminals. Before the mid-1800s, law enforcement officers with extraordinary visual memories, so-called "camera eyes," identified previously arrested offenders by sight alone. Around 1870, French anthropologist Alphonse Bertillon devised a system to measure and record the dimensions of certain bony parts of the body. Upon investigation, there were indeed two men who looked very similar. AD 1400s - Persia 1600s 1685 - Bidloo
ThrillWriting: Blood Pattern Information for Thriller Writers But also, my youngest daughter is a type 1 diabetic. I prick her finger, and use her blood, an average of 21 times a day to figure things out. A drop of blood is analyzed by her meter giving me a snap shot of what’s going on in her body. Is it the whole picture? No. Is it the big picture? This is my understanding of how a forensic scientist goes to work. Mechanisms o:f Deposition:Passive - clot, drip, pool, flow saturation, serum separation.Transfer - swipe and wipeProjected - arterial spurts, cast off, expiration, splashesMiscellaneous - fly spots, voids Transfer Patterns - occur when an object that has blood on it rests on a surface leaving an outline. Blood will change its pattern based on the angle at which it contacted the surface. THE USE OF LCV - is a chemical substance that is used to check for blood in - * Missing person cases where a crime is suspected. * Areas where a suspected violent crime occurred but it has been cleaned/bleached * Visible substances suspected to be blood
Blood Types: ABO and Rh (with donuts and sprinkles!) The man who cleans up blood after murders Image copyright Bénédicte Desrus / Alamy Mexico has one of the highest murder rates in the world, but who cleans up the blood at the crime scene when the police and investigators have left? Donovan Tavera is Mexico's first forensic cleaner. What happens to the blood after a murder? The first time I saw a dead body was when I was 12 years old. As well as us bystanders there were police officers and investigators. I asked her: "Who cleans the blood after a murder?" When my father came home from work I asked him too: "What happens to the blood after a murder? That was when I decided to find out for myself. A murder isn't the same as an accident - in a murder there is a lot of blood. When I was about 17 I started experimenting. And that's how I became a forensic cleaner. Over the years I have invented more than 300 different formulas to clean up blood. Before I come I ask what happened, and where the corpse is. Find out more I am the last person to visit the scene of the crime.
Violence Formula: Analyzing TV, Video and Movies Violence is the foundation of many films, TV movies, and action series. In fact, violence is often synonymous with "action." Because screenwriters, directors and producers use violence often and in many ways, how do we begin to recognize the distinctions in media violence? 1. Without the violence, there would be no story. Take a look at your daily TV listings. TV action series demonstrate a similar inclination for violence driving the story. TV and film plots begin with violence, and impending conflict continues to drive the story. 2. TV violence doesn't bleed. Perhaps the most chilling aspect of the media's portrayal of violence is that when people are killed, they simply disappear. 3. Media violence takes place in a world of good and bad. to be enlisted very quickly. As a result, TV and film criminals are reduced to caricatures. Bad guys have to be really bad otherwise good guys wouldn't be justified in clobbering them. How to Teach the Violence Formula to Others Violent Storylines
List of digital forensics tools During the 1980s, most digital forensic investigations consisted of "live analysis", examining digital media directly using non-specialist tools. In the 1990s, several freeware and other proprietary tools (both hardware and software) were created to allow investigations to take place without modifying media. This first set of tools mainly focused on computer forensics, although in recent years similar tools have evolved for the field of mobile device forensics. Computer forensics Memory forensics Memory forensics tools are used to acquire and/or analyze a computer's volatile memory (RAM). Mobile device forensics Mobile forensics tools tend to consist of both a hardware and software component. Other References
Explosions - Chemistry Encyclopedia - reaction, examples, gas, equation, molecule, mass, atom Photo by: Ramzi Hachicho An explosion is a sudden, violent change of potential energy to work, which transfers to its surroundings in the form of a rapidly moving rise in pressure called a blast wave or shock wave. The shock wave can cause substantial damage. Potential energy may exist in either of three forms before an explosion occurs: nuclear , chemical, or physical. Generally, nuclear explosions are much larger and more destructive than chemical or physical explosions. Nuclear Explosions Nuclear explosions may be caused by either fusion or fission reactions. In a fission reaction, a single large atom, such as uranium, is bombarded with neutrons, causing the nucleus of the atom to split into two smaller nuclei and several neutrons. A nuclear explosion at sea. Both fusion and fission reactions can be used in bombs. Chemical Explosions Chemical explosions may be either decomposition or combination reactions. It should be kept in mind that explosives are generally unstable compounds.
decomposition FACTS: WHAT HAPPENS TO A BODY AFTER DEATH (WARNING - Not for the squeamish) UPON DEATH Nature is very efficient at breaking down human corpses. When you die your heart stops pumping blood around your body, thus depriving your cells of oxygen, which rapidly begin to die. Decomposing starts almost immediately, with the skin going through several changes in colour as the blood stops circulating leaving the body an ashen color. However different cells die at different rates. Upon death blood also starts to settle in the those parts of the body that are closest to the ground, turning the top part grayish white and waxy looking, whilst darkening the underside. Funeral directors (Undertakers) tend to lift the head of a corpse in the coffin in order to prevent discolouring of the face. The intestines are packed with millions of micro-organisms that don't die with the person. EMBALMING Embalming is the practice of preserving human (or animal) remains.
Reddy's Forensic Page: forensic science for high school students This list of books is for FORENSIC SCIENCE FOR HIGH SCHOOL STUDENTS only. For latest books in forensic science and books of general forensic interest for students and professionals and for books in speciality areas like Forensic DNA, Fingerprints, visit individual pages or visit FORENSIC SCIENCE BOOK STORE. You can buy these books at Discount Prices from Amazon.com. <A HREF=" WHAT IS FORENSIC SCIENCE? FORENSIC SCIENCE SIMPLIFIED - NFSTC National Forensic Science Technology Centre (NFSTC) Forensic Science Simplified Forensic Audio and Video Analysis, Bloodstain Pattern Analysis, Crime Scene Investigation (CSI), Digital Evidence, DNA Evidence, Forensic Drug Analysis, Forensic Evidence Admissibility & Expert Witnesses, Explosives Analysis, Fingerprins Analysis, Firearms Examinations, Footwear & Tire Track Examination, Footwear & Tire Track Examination, Crime Scene Photography, Forensic Document Examination, Trace Evidence
Taphonomy: What Happens To Bones After Burial? | Bones Don't Lie Last week I discussed a way of preserving bodies almost indefinitely in some cases: embalming. On the other side of this is decay, the process of bodily decline and biological breakdown of the flesh. If you’ve ever watched any of the forensics crime shows, you know that understanding decay and changes in the body can be a key factor in determining when the individual died and how the body was treated after death. But its also important for archaeologists dealing with remains that are ancient. First, let’s look at the early stages of decay. I won’t go into the gooey details, but following death the flesh of the body goes through five stages. Stages of Decomposition Using a Pig, via Wikimedia Taphonomy is the study of what happens to remains after the death of the living creature. Grave of Anglo-Saxon, no remains left due to acidic soil, via CSI Anglo-Saxon Anglo-Saxon Burial, bones somewhat intact, via Daily Mail Cultural practices can also affect how well bone is preserved. Works Cited
Forensics Illustrated--Step Under the Tape This web site is copyright of Brennon Sapp and bsapp.com. The images and texts remain the intellectual property of their respective owners. Users of the images and texts accessible through bsapp.com agree to the following conditions of use: What you MAY do: Users may cite the texts. Citations should credit bsapp.com. What you MAY NOT do: These images and texts are for educational use only and may not be used for any non-educational or commercial purpose without written permission from copyright holders. If you are seeking permission to use an image or text for a purpose not covered above, please contact the copyright holder.