Personally I don't believe it does... I'll admit that sometimes I'll expel into the bathtub, but in my situation it is just easier that way. A high pressure nozzle is used to rinse it down the drain, and straight, uncut Pine Sol in a spray bottle used for cleaning up.
I'm not into scat at all! Actually it kind-of grosses me out. But like I said, in my particular situation it's just easier using the tub. Don't have a problem dealing with cleaning up my own, but couldn't do someone elses!
Isn't it strange that most people can deal with their own, but not someone elses?
It's like a fart... Who will admit that they don't mind the smell of their own farts, but can't stand someone else's farts!