In the US, Atlanta's MARTA subway system has been roundly criticised for, among other things, smelling like pee, and the transit line won't take it sitting down: this month, MARTA began installing first-of-its-kind urination detectors in the subway's elevators.
Yes, the first diddle-detecting elevator went online just before the holiday travel rush. With a row of 10 floor-height splash detectors along both side walls, there's no way to relieve yourself without alerting the police.
The incident rate in the particularly urine-y elevator where the first system was installed has dropped to one — and that offender was arrested mid-stream. Still, with 111 elevators in Atlanta's subway system, and at a cost of $US10,000 per detector, the number one concern is whether MARTA might be flushing money down the drain; many stations have restroom facilities that were shuttered in 2010 due to budget limitations and remain closed today.