Detailed Procedure:

Typewriters and printers should be collected when the laboratory will be asked to determine the origin of a questioned document. Rather than take an exemplar at the scene, the entire machine should be collected so the laboratory can do a complete analysis. Do not attempt to remove the typewriter ribbon or ink cartridge; collect the entire typewriter or printer. If it is not possible to collect the typewriter or printer, consult the laboratory for further instructions and assistance.

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To collect typewriters and printers:

1. Photograph the item in place.

2. Wear new, unused, clean latex or nitrile gloves.

3. Label a rigid collection container large enough for the item, such as a box, with identifying information, including case number, date, exhibit number, a brief description, and your name.

4. If the item is a printer attached to a computer, follow the proper procedure for collecting a computer before packaging the printer.

5. Place the item in the container and secure it. Include any manuals, cables, or cartridges/ribbons that go with the typewriter/printer. Seal the container with evidence tape, and initial and date the tape.

6. Store the item in a secure location, such as a locked evidence van or your vehicle, until you are able to transport it to the laboratory.

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If the item is wet, dry it first using the procedure for wet documents as described under "Charred and/or Wet Documents" in this Guide.

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Laboratory testing of typewriters and printers may be able to determine:

• Whether a questioned document was typed on a particular typewriter or printed by a particular printer.

• What make and model of typewriter or printer was used to type a questioned document.

• Whether the text of a typed or printed document was prepared at the same time or whether the document was removed, reinserted, and additional typed/printed entries made.

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Source:

Crime Scene and Evidence Collection Handbook. Bureau of Alcohol, Tobacco, Firearms and Explosives, 2005.