NTT DoCoMo has introduced a system that lets mass transit companies test their drivers at any given time to see if they have been dabbling with some happy juice while on the job. A small breath-alcohol sensor is attached to one of DoCoMo's FOMA 3G phones. The driver will breathe into the sensor normally and the phone will transmit the results to a personal computer at the transit company HQ. FOMA will be able to prevent cheating by utilizing FOMA's videophone abilities. Maybe that is the problem with cab drivers nowadays. That makes perfect sense, they are all drunk!

DoCoMo cell phone can test whether drivers have been drinking [textually]