question: My sink smelled like pee this morning as I was cleaning it I found a cup with yellow fluid and when I took a sniff it reaked. My roommate was drunk over the weekend and denies he peed in the cup. Is there a way to test if the fluid is pee. I cant stand the fact that he feels like he can get away with it. Also can I catch anything from the pee? I smelled and touched it a bit