The reason grooves are rifled into the bore of a gun is so that a:
bullet will be made to spin and hence have a true and accurate course on leaving the barrel.bullet moving through will have unique striations.manufacturer can put its unique mark on its productbullet will be reduced in size before it exits the gun.4CHOICE_1_2_40
The comparison of two bullets is possible with the comparison microscope. Such a study is made difficult by the fact that:
lands and grooves are subject to wear and tear and hence striation markings are susceptible to continuing change. often evidence bullets are distorted on impact and only small areas are found with intact markings. the presence of grit and rust can to some degree alter the marking on bullets fired through the same barrel. All of the above4CHOICE_1_3_40
Distinctive markings of shells and cartridges can be made by the:
extractor and ejector mechanism. breech lock. firing pin. all of the above4CHOICE_1_4_30
Generally speaking, the amount of gun powder particles found around a bullet hole is ________ to the distance from which the weapon was fired.
indirectly related not relateddirectly related4CHOICE_1_5_30
Gun powder residue patterns can be detected by:
the Greiss test.IR photograph. both A and Bneither A nor B 4CHOICE_1_6_20
Chokes are sometimes found on shotguns where they function to constrict the end of the barrel. The speed and distance traveled by pellets fired from a narrow choke is ________ the speed and distance traveled by pellets fired from a shotgun with a wide choke.
the same asgreater thanless than 4CHOICE_1_7_20
The \"dermal nitrate test\" has fallen into disfavor because of its lack of specificity. Which of the following common materials does NOT give a misleading positive reaction to this test?
The likelihood of detecting GSR on swabs taken from living subjects more than six hours after a firing has occurred is ________ the likelihood of detecting GSR within two hours of a firing.
the same as less thangreater than 4CHOICE_1_9_10
Which technique of detecting GSR holds the most promise for the immediate future?
SEM primer residue detectionneutron activation analysis dermal nitrate test hand swabs 4CHOICE_1_10_10
When an etching agent is applied to a metal surface in order to restore a removed serial number the stamped area will dissolve at ________ as the unstamped area.
a greater ratethe same rate a slower rate 4CHOICE_1_11_10
When a gun is recovered from an underwater location, it should be:
transported to the crime lab in a container with enough of the same water necessary to keep it submerged.placed in an air-tight plastic bag. cleaned and dried.submitted to crime lab in a paper bag.4CHOICE_1_12_20
Discharged evidence bullets must be carefully handled to avoid damage to the:
Tools and tool marks are often found at burglary scenes and can be useful evidence. Proper evidence collection by the field investigator would include:
reporting whether a tool found at the scene fit into the tool marks. making test marks with the suspected tool onto a soft metal surface at the crime scene. taking a photograph and cast of the marks, if necessary.packing of tool and tool mark evidence together so that the crime lab personnel knows they are thought to be a matched set. 4CHOICE_1_14_10
Shoe and tire marks impressed into soft earth can be best preserved by:
photographing and casting with dental stone.photographing and then use of the electrostatic lifting technique. casting with dental stone and then attempting the electrostatic lift technique. It is not possible to accurately preserve such markings. 4CHOICE_1_15_10
Which is NOT a class characteristic of a suspect's sneaker?
wear marksbrandsizestyle4CHOICE_1_16_10
The possibility of recognizing known writing habits in samples produced when a writer is under the influence of drugs or alcohol is ________ the possibility of recognizing known writing habits produced when the writer of a sample is not under the influence of drugs or alcohol.
less thangreater thanthe same as4CHOICE_1_17_30
The ease with which a child's handwriting can be individualized is ________ the ease with which one can individualize an adult's handwriting.
the same asgreater thanless than4CHOICE_1_18_40
The writing characteristics of a person may be altered by whether:
a significant amount of time has passed between writing of exemplar and the questioned document.paper is ruled or unruled. pencil, ballpoint or fountain pen is used. all of the above4CHOICE_1_19_40
With regard to the constitutionality of obtaining handwriting exemplars, the courts have ruled all of the following EXCEPT:
such action does not constitute unreasonable search and seizure of a person. handwriting is an identifying physical characteristic. it is not in violation of Fourth Amendment rights. Fifth Amendment privileges apply.4CHOICE_1_20_40
In dealing with fax machines, photocopiers and computer printers, which class characteristics might be examined?
chemical composition of toner type of toner-to-paper fusing method brand of machine manufacturer all of the above4CHOICE_1_21_30
Infrared luminescence is used to:
detect if two different inks were used in the writing of a document. reveal writing that has been erased. both A and B4CHOICE_1_22_40
Which of the following is NOT considered a hardware device?
the monitor the hard disk drive the mouse the operating system4CHOICE_1_23_30
Which of the following is NOT a type of RAM?
SSIM DDIM DABnone of the above 4CHOICE_1_24_40
A Network Interface Card (NIC) enables a personal computer to communicate with other computers via:
a wired connection. a wireless connection.a satellite connection. A and B only4CHOICE_1_25_20
The first thing a crime scene investigator should do when encountering computer forensic evidence is:
unplug every device from the CPU to preserve the hard disk drive. procure a warrant to search remove the system to the laboratory for processing. tape each cable to its adjoining component in an effort to preserve the integrity of the physical connections. 4