From submitted material (e.g. underwear) it is possible to do a sperm detection test.
If sperm is detected in the sample then it is possible to determine the
DNA profile of the person from whom the sperm originates. This forensic DNA profile can then be compared with the DNA profile of another person whose identity is known, from samples provided (cigarette butts, nails, plucked hair, glasses from which the person was drunk, and so on).
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