McGruber writes: The Metropolitan Atlanta Rapid Transit Authority (MARTA, http://itsmarta.com/) has begun installing a urine detection system in its elevators. Activated by moisture and warmth, the system sets off an alarm which nearby MARTA police officers can answer in seconds. MARTA said someone urinated in the test elevator an average of once a day, but only once a month after the detection system was installed and that person was caught and arrested.
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