Biological stains resulting from sexual activity often contain a mixture of both male and female DNA. The female DNA usually originates from epithelial cells from the vaginal wall, the mouth or skin, while the male DNA comes from sperm cells. After the stain is extracted, a DNA profile is then created.If the DNA shows that the stain is from 2 people (your partner and another person), we can use DNA testing to show whether or not the second person is you or an unknown person. We do this by having you submit a cheek swab of yourself. We will then compare your DNA profile to that of the DNA from the item you sent in, to tell you whether or not the second person is you or someone else.
Mouth Sample Collection Instructions: