By Chris Cooper
The main relied on nonfiction sequence out there, Eyewitness Books supply an in-depth, complete examine their topics with a designated integration of phrases and images.
a desirable examine the instruments and methods utilized by forensic scientists in fixing crimes-from fingerprint research to DNA trying out.
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Extra info for Forensic Science (DK Eyewitness Books)
44 THE E-FIT SYSTEM A computerized version of the photographic identification system is called E-FIT. It was originally developed for Scotland Yard in the UK, but is now used by police forces all around the globe. A similar system called FACES exists in the United States. The witness sits at a computer terminal and selects facial features from the choices presented on the screen. At left, a witness has made a start, but is dissatisfied with the full head of hair that is displayed. In the second image (below), the witness has changed the hairstyle to show some thinning and receding of the hairline, but has added a full moustache.
Seen on a chemical bottle, or on the door of a cabinet or room, the skull and crossbones means that there is poison—a toxic substance—inside. The implications of this traditional and universal symbol are understood by the public around the world. crime, samples from an autopsy or crime scene may be sent to toxicologists, who test them for toxins. A toxin is any substance that is harmful, or poisonous, to the human body. The drugs we take for our health are medicines. Drugs taken for pleasure range from the mild stimulant caffeine (found in coffee, tea, and cola drinks), through alcohol and nicotine (the active ingredient in tobacco), to more powerful and harmful illegal drugs such as cannabis, cocaine, and heroin.
DEADLY PATH A policeman is using a rod to reconstruct the path followed by a bullet that struck this car. Laser beams or strings are sometimes used instead. If a bullet hole is deep enough, the police may slide a probe into it to show the direction of entry. Tracing trajectories in this way is especially important if more than one person was using a gun at the scene. 33 Probable position of gun Rod links bullet hole with gun’s position At the scene of the crime A crime investigation doesn’t always begin with a crime scene or a body: it may be sparked by a missingperson’s report.