[trashtester]

> On the other hand, a mandatory breathalyzer for ignition would be useful to prevent a lone driver from driving drunk. We already have them for people with DUIs, so we should make them mandatory for all cars.

People who frequently drive under the influence tend to have a strong habit. Those would just keep driving an old car if such a device is introduced in new cars.

For most other people, such a device would be seen as a very annoying.

For it to have the desired impact,it needs to be fitted in all old cars, and then we're adding a significant expense on top of the annoyance.

Now, MAYBE if the device can be used to reduce insurance fees, it might be doable, but only in countries without public healthcare.