By DK Publishing
The main relied on nonfiction sequence out there, Eyewitness Books offer an in-depth, entire examine their topics with a distinct integration of phrases and photographs. Eyewitness Books now include an immense wall chart and a CD of clip-art. 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)
Example text
Crime-scene bullet Test bullet SIGNATURE OF A GUN A bullet from a crime scene is placed under a comparison microscope together with a bullet fired in the laboratory from a suspect weapon, in order to compare them at high magnification. The forensic investigator will be looking for several features in the comparison. Marks are left on the rear end of the cartridge when it is forced into the chamber on loading. Marks are also left by the hammer or firing-pin when it is fired. The rifling from the barrel leaves characteristic grooves running the length of the bullet.
Emblazoned on pirate flags long ago to instill fear in their enemies, the skull and crossbones symbol is still used today to warn of deadly danger. 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.
They may also lay their eggs in the maggots on the body. Water for consistent humidity MAGGOT FARM This net houses a family of blowfly pupae growing on rotting meat in a forensic science laboratory. The scientists study their rate of growth, the stages they go through, the effects of light and temperature, and the effects on insect development of drugs or alcohol in the meat—this imitates the effects of these substances in dead bodies. All this information is valuable to forensic scientists trying to figure out the time and place of a suspicious death.