interesting test

so i just got back from taking a whiz in the office restroom. while doing so, i came across a urinal in which somebody had spit their gum.

if someone were to try to find the culprit and had their handy dna testing kit readily available, would he/she be able to secure the dna of the person from the spit in the chewed up gum? or would the piss overpower said any usable evidence in the ABC gumwad? would someone falsely accuse me for littering when all i'm guilty of is taking a piss on the previously placed gum?