Though requiring the driver to blow into a straw doesn't seem particularly "passive"--whatever that means.
But the text makes it seem like they would position cameras toward your face and do analysis on impairment indicators like eye movement.
Imagine a medical condition that makes it look like you are impaired. Now, you have to go to the dealer with a doctor's note to get this system disabled. Or when you want to rent a car.
Or, if there is a case when driving impaired would be better then the alternative. You and a friend are camping in the woods out of cell range, you both have some beers then one of you trips and gets a deep cut on the leg. Now you have to wait a couple hours before he can drive you to where you can get cell signal, hope you don't bleed out.