> Among the systems that have been studied are ones that monitor a driver for signs of distracted, impaired or fatigued driving. One uses sensors that scan drivers’ eyes for signs that are similar to ones that police officers look for when they suspect impairment during traffic stops.
Even breathalyzers aren’t as fool-proof as they sound. Apparently eating certain meals right before using a breathalyzer can trigger false positives. Even breathalyzers have not insignificant numbers of false positives they would become a huge problem if forced upon the entire driving population.
So even with breathalyzers, it’s still about magical thinking about technology’s ability to monitor people’s behavior.