Lab Service:
Infidelity Testing:
Testing for Semen in Panties.
Notice under regular room lighting, the underwear does not show the semen stain, only vaginal secretion. However, under the forensic lighting, Dr. Bennett was able to find signs of semen fluid that was not visible under room lighting. Testing of the vaginal secretions did not reveal the presence of semen. However, testing the area visible under forensic light was positive for semen.
Initially, the customer was wanting to perform a test himself using a kit off the internet. However, without the help of Dr. Bennett's forensic tools and skills, the client would have been unsuccessful in detecting the semen and the husband of this adulterous woman would not have proof that his wife was cheating.
Dr. Bennett detected semen in the outer area and was then able to preform a Y-STR DNA profile which showed the semen did not match the DNA of the husband.
Science Behind Seminal Fluid Testing of Female Underwear:
Normal female discharge is relatively viscous, meaning that it is relatively thick (thicker than water). When that discharge occurs, it deposits in the cotton area immediately underneath the vaginal cleft and usually does not spread much beyond that area due to its high viscosity. In contrast, seminal fluid, although it starts out relatively viscous, within minutes undergoes a biological process called liquefaction which means that it's viscosity drops dramatically and the semen almost becomes watery. This causes the seminal fluid to flow outward from the area of the underwear beyond the vaginal cleft. Therefore seminal fluid can be better isolated and detected beyond the area of the center line of the female underwear where normal vaginal discharge occurs.
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