Originally Posted by S13GG

interlock or something, and actually, yes/no, I drove a buddies truck equiped with that, (due to his fatigue after 30 something hours straight working) and every 45 minutes or something the system will beep requiring another sample (while driving). I would have to wake him up so he could give his sample, otherwise the car just shuts down (?).

So yeah even that system is subvertible, but I beleive it requires official inspection every 30-60 days at the owners expense