Of course, toilets are typically used by more than one person, so the device needs to be able to discern one user from another. To that end, Gambhir and his colleagues fitted the system’s flush lever with a fingerprint scanner. Not content to stop there, the scientists added a camera that sits inside the bowl. Powered by machine learning, this camera identifies people by remembering their idiosyncratic buttholes.
DB2
I’d hate to be the advertising genius tasked with marketing this advance. 
Wendy
Yep, and since it’s been nearly five years since this article came out, I suspect no such genius arose yet.
Pete
Here’s an interesting quote from the article:
“Now that we know our an@l prints are unique, there’s a whole world of possible applications. Everything from airport security to unlocking phones could be revolutionized.”
Probably explains the slow inception of this scientific breakthrough.
I don’t need a toilet that makes flushing easier. I need a body that works like it did 30 years ago.
There is ONE such entity–in Florida. Lives in a place called Mar-a-Poo-Poo (so appropriate !!). LONG history of “issues” with toilets and paper…
Still people are able to advertise and talk about bidet technology. Toilets that wash your back side are available. Adding sensor technology should be no big deal.
Detecting acetone in your urine indicating diabetic could save a life. And there probably are others like blood in stools.
One such company does it via mail order. Used to see a lot of ads on TV. Not many ads at the moment. Requires prescription–probably to get insurance/Medicare to pay for it.