How do blind people know they r done wiping after a dump?

Question

always wondered this

Answer 1

Try and expand your mind further than toilet.  

Answer 2

lol...lmao... That is so funny!

I guess they smell check!

Answer 3

They probably developed their other senses to the state of being supreme over regular humans so thus; they can touch feel every square nanometer of a toilet paper roll, they can smell every c**p particle lingering in their buttocks, and they can picture the sound waves made by the splashing of the water.