I once helped someone get their car home after one of these was installed. Their license would not be returned until it was installed, but they weren't allowed to leave it on the lot. Someone else drove it there, and then I got to experience the breathalyzer to drive it home.
The interesting part is how bad the interlock was. First off, it can apparently randomly not work, so you get three tries. Worse yet, per the official documentation, apparently they can misdetect an ignition while driving at speed, and when that happens you have to pull over and blow within thirty seconds. Now, this is not something you can do while driving, as you have to look at the camera while you do it, on top of needing to have a deep breath. There's no motivation to improve this, because the customer is the legal system, not the person who has to have it installed
Having to blow while you're already driving is supposed to be a feature. It's to dissuade people from successfully turning on their car, immediately drinking, and then driving.
Isn’t there a proposed law to install these into every single new car?
I was the DD for my friend's bachelor party and as we were leaving the bar, I saw this older gentleman struggling to start his vehicle. I had a hard time making out what he was telling me, but it looked like he had one of these devices on his car. Being the Good Samaritan that I am, I blew into the device, his car started, and he went happily on his way.
I knew somebody with an interlock and if they were around too much car exhaust in a relatively enclosed space, the ethanol in the air would trip the detector apparently.