Handbook of Forensic Services (pdf) - FBI

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Handbook of Forens c Serv ces 2007 two-d mens onal res due or dust mpress on to a lifting film. It also allows the impression to be sh pped to the Laboratory for photograph ng and exam nat on. Electrostatic Lifts An electrostat c l ft ng dev ce l fts footwear mpress ons from porous and nonporous surfaces w thout damag ng the mpress ons. Th s dev ce works on dry dust or res due mpress ons on clean surfaces but w ll not work f the mpress ons were wet or have become wet. Electrostat c l ft ng dev ces come w th nstruct ons for use. Storing Electrostatic Lifting Film Lifted impressions are damaged easily if the film is not stored properly. The film has a residual charge that attracts dust and debr s and causes the film to cling to other surfaces. To preserve and store the lifting film containing an impression, tape one edge of the film securely in a clean, smooth, high-quality paper file folder or tape the edges securely n a shallow photograph c paper box. Low-grade cardboard boxes such as p zza boxes must not be used because the res dual charge on the film will pull dust from the box and contam nate the mpress on. Items that conta n a dry res due footwear mpress on must not be wrapped or stored n 128
Handbook of Forens c Serv ces 2007 plast c because a part al transfer of the mpress on to the plast c w ll occur. Gelatin and Adhesive Lifts Gelat n l fters can be used to l ft mpress ons from porous and nonporous surfaces. Black gelat n l fters work well for l ft ng l ght-colored dry or wet mpress ons. Wh te gelat n l fters can be used to lift impressions developed with fingerprint powders or mpress ons dark enough to contrast w th a wh te background. Adhes ve l fters can be used only to l ft mpress ons from smooth, nonporous surfaces. Wh te adhes ve l fters can be used to l ft impressions developed with fingerprint powders. Transparent adhes ve l fters can be used to l ft impressions developed with black or fluorescent powders. Transparent tapes such as two- nch fingerprint-lifting tape also can be used to lift powdered mpress ons f the mpress ons are transferred to a wh te card. Lifting Materials ß Electrostatic: can be used on porous and nonporous surfaces. Used to l ft dry dust and res due mpress ons. Nondestruct ve. Useful for search ng for latent mpress ons. 129
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