DNA testing on fabric DNA testing on fabric To determine the source of the stain on Monica Lewinsky's dress, the FBI is using DNA fingerprinting. The former White House intern has reportedly testified about having had a sexual relationship with President Clinton. The FBI has not revealed how it conducts DNA fingerprinting. However, it does use routine tests.
Analysts first examine the fabric under a microscope to see if it contains DNA material.
How It Works 1. A sample from evidence smaller than a dime is large enough to conduct a test, which will determine the makeup of the sample. A sample of blood or saliva is taken from the suspect. DNA from the two samples are compared to see if there is a match. DNA can remain in clothing for years, even after it has been dry cleaned.