You could since they used it, here is the list of personal concerns according to strength. This information and much more regarding personal concerns can be found here
http://www.luckymojo.com/bodyfluids.html
Genital fluids: menstrual blood, semen, vaginal fluid
Other biological concerns: urine, feces, sweat, blood, spit
Hair: pubic, head, armpit, beard
Person's unwashed clothing: underwear, socks, handkerchief
Person's foot track lifted from the dirt
"Shed" body items: nail clippings, baby teeth
Person's bath water, wash water, drinking water
Person's handwriting on paper
Something Person owned or wore
Something Person touched, e.g. butt from smoked cigarette
Photo of Person
Drawing or silhouette of Person
Person's business card
Person's full name written on paper 9 times