Forensic Analysis 8521 Spermatozoa

Some guidelines recommend that the forensic practitioner perform an immediate microscopic examination of a wet mount of the material obtained from the vaginal fornices to identify motile spermatozoa on the basis that the presence and motility of spermatozoa may help determine whether recent vaginal ejaculation had occurred. However, a considerable body of opinion does not commend this practice (104). Forensic science laboratories have specialist extraction procedures, staining techniques, and microscopic equipment to maximize spermatozoa recovery and facilitate identification. A survey of 300 cases in which spermatozoa were eventually identified found that they were only detected in four of the cases in the native preparation (before the application of specialist stains) (105).

When nonconsensual penile-vaginal penetration is alleged, the samples are examined microscopically by the forensic scientist to identify spermatozoa, and a DNA analysis is performed on any spermatozoa found.

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