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NCJ Number: 153531 Find in a Library
Title: Identification of Polydimethylsiloxane Lubricant Traces From Latex Condoms in Cases of Sexual Assault
Journal: Journal of the Forensic Science Society  Volume:34  Issue:4  Dated:(October-December 1994)  Pages:245-256
Author(s): R D Blackledge; M Vincenti
Date Published: 1994
Page Count: 12
Type: Report (Technical)
Format: Article
Language: English
Country: United Kingdom
Annotation: Because the use of condoms in sex crimes is likely to increase, a protocol was developed that could extract polydimethylsiloxane (PDMS), a lubricant commonly used by condom manufacturers, and the spermicide nonoxynol-9 from evidence items and separately identify them by Fourier transform infrared spectroscopy.
Abstract: At least some discrimination was provided by microscopically identifying insoluble lubricants such as corn starch, lycopodium, silica, and talc which are added to some condom brands. Desorption chemical ionization mass spectrometry was used to compare the PDMS used by different manufacturers and to detect as little as 20 ng. The protocol was successfully used in two actual cases, one in which the assailant wore a lubricated condom and a second in which he did not but claimed to have done so. The authors conclude that the protocol is sufficiently sensitive to detect PDMS traces but is not so sensitive that it misleads investigators about other trace elements. The protocol makes it possible to realize some discrimination between condom lubricant traces based on the presence or absence of the spermicide nonoxynol-9. Further, the presence of condom lubricant traces in vaginal swabs may be confirmed by desorption chemical ionization mass spectrometry. 22 references and 8 figures
Main Term(s): Science and Technology
Index Term(s): Criminal investigation; Criminalistics; Evidence identification; Forensic sciences; Infrared techniques; Sex offenders; Sex offenses; Sexual assault victims; Spectroscopy; Suspect identification
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