Cameras/behavior monitoring which will produce interesting results. The system will either have to be sensitive enough to produce 'false' alerts due to tired &

Cameras/behavior monitoring which will produce interesting results. The system will either have to be sensitive enough to produce 'false' alerts due to tired & distracted drivers while it will certainly allow a chronic drinker and alcoholics drive well above the legal BAC. Measuring passive cabin air seems nearly impossible. A highly intoxicated passenger would easily produce false positives. One option I guess is to measure the BAC at every single seat to establish a baseline. I still don't see how this could work if the windows are down. There are a few other options such as measuring sweat (doesn't work if you wear gloves or some skin conditions), thermal/blood flow imaging (inconsistent between individuals and would have race/genetic biases), etc. IMO anything beyond detecting erratic movements of the steering wheel and accelerator is going to have a lot of problems.