Yikes. This just made me think of chemical fluid analysis (if the advertising provider buys the drain (!)), which provides an absolute mountain of data. Camera

Yikes. This just made me think of chemical fluid analysis (if the advertising provider buys the drain (!)), which provides an absolute mountain of data. Cameras are rightly forbidden *inside* restrooms, but there are often security cameras in corridors leading to them. Run facial recognition off of those, store the data for a *leeetle* while, consolidate/centralize all the data back to one warehouse, and... you just built a scarily accurate biometric tracking system that can sell... [gets sad about implications and stops typing]