
4 August
San Francisco has a problem you notice almost immediately once you arrive: some areas stink of urine.
The problem is most noticeable, and pungent, around the city's metro stations.
And it's at one station - 16th & Mission - where an interesting experiment is taking place.
San Francisco's Department of Public Works (DPW) is trying out a new idea that was and announced last week to much intrigue.
They've coated some walls with a special type of paint that would make urine splash wildly up at the perpetrator - over his shoes, legs… even, as you can see in the video above, even their face.
With video:
http://www.bbc.com/news/technology-33766003