On first blush I thought the same thing - what, you're going to have to blow into some tube to start your car? I can understand this for people who have been convicted of drunk driving, but for everyone? But looking around it appears they have some mechanism by which they can determine with some degree of accuracy via touch, and it's integrated into the ignition button on a car:
https://www.dadss.org/touch-technology
They also appear to have other approaches as well, but this one seems like it would be almost transparent to the operation of the car.
Honestly I have zero objection to something that worked in this fashion - I suspect it would save a ton of lives. I think the knee jerk reaction that it's somehow a big brother kind of thing is a bit disingenuous, like saying "The government shouldn't interfere with my ability to drive drunk and potentially hurt people". I think this is much more akin to when wearing seat belts became the law - people moaned and complained but at the end of the day it's better for both themselves and others in the vehicle.
The speeding thing is completely unrelated and really shouldn't be mixed into this - how about solving one problem at a time well, instead of lumping a bunch together and solving none. I've had friends badly injured by drunk drivers, and in all the cases the drunk driver wasn't exceeding the posted speed limit. In one they just smashed into a parked car and hit them on the sidewalk, in one they swerved into oncoming traffic and collided head on, and the last drove into a store at full speed. Thankfully these were three different people I know, and not one incredibly unlucky person. ;)