Originally Posted by
teeteringhead
(Forensic question: Does poo have DNA? Technically it's never been inside the body, only in the alimentary canal, which is - ahem - open at both ends.)
[Edited to add:] I suppose if the Chalfonts were bleeding there would be some blood; ergo DNA.......
If it helps, the chances of finding enough DNA in urine to identify the previous owner are slim to none.