I remember reading somewhere you can tell which are actual shooting stars by how long the trail is and how long they're in the sky. The ones that are poo burn up quick
I know they have done it a few times because they wanted to study how being in orbit affected digestion and bowel functions. But I don't think it is a regular thing.
https://www.space.com/22597-space-poop-astronaut-toilet-explained.html