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6. Police officers were led to believe that many weapons sold at a certain gun store were sold illegally. Upon investigating the lead, the officers learned that all of the weapons sold by the store that were made by Precision Arms were sold legally. Also, none of the illegally sold weapons were .45 caliber.
7. Impressions made by the ridges on the ends of the fingers and thumbs are useful means of identification, since no two persons have the same pattern of ridges. If finger patterns from fingerprints are not decipherable, then they cannot be classified by general shape and contour or by pattern type. If they cannot be classified by these characteristics, then it is impossible to identify the person to whom the fingerprints belong.
8. Explosives are substances or devices capable of producing a volume of rapidly expanding gases that exert a sudden pressure on their surroundings. Chemical explosives are the most commonly used, although there are mechanical and nuclear explosives. All mechanical explosives are devices in which a physical reaction is produced, such as that caused by overloading a container with compressed air. While nuclear explosives are by far the most powerful, all nuclear explosives have been restricted to military weapons.
9. The alphanumeric coding of a fingerprint is a systematic description of the main patterns on the print. Within a certain metropolitan district, 90% of the population have fingerprints that can be alphanumerically coded.
10. The printed output of some computer-driven printers can be recognized by forensic analysts. The “Acme Model 200” printer was manufactured using two different inking mechanisms, one of which yields a “Type A” micropattern of ink spray around its characters. Of all Acme Model 200 printers, 70% produce this Type A micropattern, which is also characteristic of some models of other printers. Forensic analysts at a crime lab have been examining a kidnap ransom note which clearly exhibits the Type A micropattern.
