PHYSICAL EVIDENCE MANUAL - Crime Scene Investigator Network
PHYSICAL EVIDENCE MANUAL - Crime Scene Investigator Network PHYSICAL EVIDENCE MANUAL - Crime Scene Investigator Network
Physical Evidence Manual 20.0 SERIAL NUMBER RESTORATION The obliteration of serial numbers and manufacturer’s marks is often done to prevent tracing ownership of articles. The laboratory uses mechanical and chemical processes that may restore the original marking in whole or part. Firearms, bicycles, motorcycles, chainsaws, boats, and cameras are all evidence items where serial numbers have been restored. Collection and Packaging of Evidence Package the evidence in a manner that will protect the area where the serial number has been obliterated. Contact the laboratory prior to delivering large items. Adopted: May 2002 Revisions: 6 Last Revision: January 31, 2008 20-1
Physical Evidence Manual Adopted: May 2002 Revisions: 6 Last Revision: January 31, 2008 21.0 TOOLMARK EVIDENCE Toolmarks are impressions or marks produced when a tool comes into contact with an object; the tool is generally the harder of the two objects. Physical contact between a tool and the surface of an object produces marks not only characteristic of the type of tool used, but marks that may be unique to a single tool. In the absence of a suspect tool, toolmark impressions can be examined in an attempt to determine the type of tool(s) that may have produced them. The following are types of tools that may be encountered are: hammers, screwdrivers, pry bars, knives, bolt cutters, pliers, tin snips, pipe wrenches, axes, and hatchets. Do not attempt to determine if a found tool fits in the toolmark. This may alter or obliterate the toolmark and trace evidence may be lost or added. Collection and Packaging of Toolmark Evidence The recovered tool should be carefully packaged to prevent the prying blade or cutting edges from having contact with any other objects that may cause an alteration of the tool. Send the whole object containing the toolmarks to the laboratory. If this is not possible, photograph the toolmark, then cut out the area with the toolmark or make a cast of the mark. Information about casting material that is appropriate for toolmarks may be obtained by contacting the laboratory. Mark the cast or cut object with appropriate information indicating its orientation such as up/down, inside/outside, and left/right directions. Package the object containing the toolmark in such a manner as to prevent alteration or damage during shipment and storage. 21-1
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Physical Evidence Manual<br />
20.0 SERIAL NUMBER RESTORATION<br />
The obliteration of serial numbers and manufacturer’s marks is often done to<br />
prevent tracing ownership of articles. The laboratory uses mechanical and<br />
chemical processes that may restore the original marking in whole or part.<br />
Firearms, bicycles, motorcycles, chainsaws, boats, and cameras are all evidence<br />
items where serial numbers have been restored.<br />
Collection and Packaging of Evidence<br />
Package the evidence in a manner that will protect the area where the serial<br />
number has been obliterated. Contact the laboratory prior to delivering large<br />
items.<br />
Adopted: May 2002<br />
Revisions: 6<br />
Last Revision: January 31, 2008<br />
20-1
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