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
Bloodstain Tutorial The success or failure of any criminal investigation often depends on the recognition of physical evidence left at a crime scene and the proper analysis of that evidence. Crime scenes that involve bloodshed often contain a wealth of information in the form of bloodstains. The pattern, size, shape, and the location of such stains may be very useful in the reconstruction of the events that occurred. Bloodstain Pattern Analysis: The examination of the shapes, locations and distribution patterns of bloodstains in order to provide an interpretation of the physical events by which they were created that is based on the premise that all bloodstains and bloodstain patterns are characteristic of the forces that have created them. The interpretation of bloodstain patterns found at the scene or on exhibits such as the clothing of the principles of the occurrence can be used to: Properties of Blood: A blood loss of 1.5 liters internally/externally is required to cause incapacitation.
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
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. As he explains here, his fascination with blood began as a young boy. What happens to the blood after a murder? The question haunted me for years, until I answered it myself. 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.
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. 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. STAGES OF DECAY Initial decay (Known as 'autolysis') - externally the corpse looks okay, but internally the organs are breaking down.
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. 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 There can be extrinsic (external) factors, or intrinsic (internal) factors that effect preservation. Cultural practices can also affect how well bone is preserved. Works Cited