It's not an "if" detector, it's a "how much" detector. It looks like it's using the LED chamber to light the film in a consistent way, and then the phone camera measures the color change to quantify how much radiation it was exposed to.
Just... really research hard before you buy one. I've seen multiple stories of cats being injured or killed when safety features on a litter robot failed (or didn't exist in the first place)
Anybody that lives above other people and drops any heavy item on the floor intentionally is a dick, there's no maybe involved here.
There's always the Jewel Cooler:

Don't forget Swiss Army Man!
15 square meters isn't the same as 15m×15m, it'd be a little smaller than 4m×4m. Still a big hole.
Jury nullification only helps if you get an actual jury.
More like homicidally stupid.
We definitely whip shitties in WI, too.
For those wondering, this played out well! OP found someone to take the job. His wife bit on the prank gleefully, was actually thrilled by the idea that OP had a son he didn't know about. When the prank was revealed, she thought it was hilarious. Ultimately pretty wholesome, OP married a keeper.
JustinTheGM
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I wasn't suggesting all automatic litter boxes are dangerous, only that some are. If someone is shopping for one, it's important to be aware that not everything on the market is safe.