Sampling Method

Data collected by the MPFSL between 1987 and 1995 (122) have shown that after vaginal intercourse, cellular material from the complainant can be recovered from the coronal sulcus (groove around the penis just below the glans) even if the suspect has washed or bathed since the offense. Swabs taken from the meatus and urethra are not suitable for microscopic assessment because some male urethral cells can be similar to vaginal cells (7). Therefore, when vaginal intercourse is alleged, two swabs (the first wet, the second dry) should be obtained sequentially from the coronal sulcus, and two additional swabs (the first wet, the second dry) should be taken sequentially from the glans and the shaft together. The swabs must be labeled accordingly, and the order in which the samples were obtained must be relayed to the scientist. The same samples are also taken if it is believed that a lubricant or condom has been used during a sexual act or if the assault involved fellatio or anal intercourse.

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