Can identify a person from as little as 1 centimeter of a single strand of hair.
https://www.sciencemag.org/news/2019/11/scientists-can-now-identify-someone-single-strand-hair
origin - https://www.pipiscrew.com/?p=15880 ultrasensitive-protein-method-lets-scientists-id-someone-from-a-single-strand-of-hair