Boffins have developed technology that can recognise who is using the toilet based on their bum alone.
Researchers at the Stanford School of Medicine say their new scanner can recognise the "unique anal print" of different people.
A camera inside the toilet bowl then matches the poop to the toilet user, who can see data on their waste.
It can even calculate "the flow rate and volume of urine, using computer vision as a uroflowmeter," reports Futurism.
Smart toilets are growing in popularity – and some can even be life-saving.
Technology that scans faeces can identify chronic diseases and bowel cancer early to warn the sufferer.
It could help with conditions such as irritable bowel syndrome (IBS) and inflammatory bowel disease (IBD).
Another company competing in the smart toilet market, called Toi Labs, even records how toilet users sit on the seat.
It also examines the volume, clarity, consistency and colour of the poop.
Founder of Toi Labs, Vik Kashyap, told The Guardian: "It’s essentially understanding when someone has abnormal patterns.
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Would you be comfortable with a camera in your bog? Have your say and see what others think in the comments below.
"It’s capable of documenting those patterns and providing reports that can be used by physicians to help in the treatment of a variety of conditions."
But as most people don’t like a camera pointing up their bottom, the scheme has raised a few concerns.
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Some people worry the data could reveal personal information – such as private medical conditions and the use of drugs.
And if health insurance companies could access the data, they could change the price of medical care based on smart toilet data.
But the scientists say all the information collected will be private and kept in an encrypted cloud server.
New-build family home 'flooded with sewage and excrement' because of baby wipe blockage
While smart toilets may be revolutionising the bog for some, plenty of other Brits have leaky loos.
In fact, new research has shown that Brits could be wasting 2.8 billion litres of water every day due to leaks in their toilet.
With each leaking toilet valve wasting between 200 and 400 litres of water daily, and almost 28 million households in the UK, a staggering seven million homes could be wasting up to 2.8 billion litres of drinkable water every day.
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