Breathalizer in every car is a retarded idea, simple reason is your mouthwash will set it off.
The breathalyzer is a retarded test. In reality if a scientist were to use it to try and prove the concept, they'd be laughed at.
Most really don't know how it works. What it's doing is measuring how much alcohol is in the blood that you respire. It relies on the average person, having an average amount of blood in their breath and being affected by it in an average way.
1) One thing in science that has been proven is many people are very very different in reactions to chemicals and even sometimes immune/other times overly affected.
2) Many things can affect the amount of blood in your breath. Ulcers, lacerations of the mouth, recent dental work. A natural propensity to have more blood in your respiration, etc.
In my case, my bottom lip was bust open. There was active blood in my mouth. This caused me to blow a .168 with only about a half dozen beers all night long. I was able to perform my field sides well (which I was asked to do on the middle line of a road with cars driving by) and even said the alphabet BACKWARDS 3 times accurately. Problem with that was the cop was just looking for the alphabet. He was a good 15 feet away and I was in the middle of a road with cars so it was hard to make out the instructions he was even giving me. On my 'tape' you can hear me both ask for a safer place to do these tests and constantly ask him to repeat what he was saying because I couldn't hear. I had a good defense case, but it really wouldn't have saved me money nor time to defend.
3) Not everyone is affected by alcohol the same way at the same level.
The only true way to get an accurate BAL is direct measurement of the blood. If one has been drinking at all and honestly feel they are not inebriated, ask for a blood test if questioned why tell them you are not denying them their ability to test you, but that you feel the breath test is not accurate for you. Do not agree to field side tests, when asked do you have any impairment that may affect your ability to perform field side tests, answer yes and decline. You do not have to perform these, they are only gathered as evidence should the officer arrest you and unfortunately even sober people usually look drunk doing them. The lawyer I saw had an interesting video showing random drunk, not drunk and not drinking people doing these tests. The idea was to guess who was legally drunk and who was not. In the end it shows people choose sober people drunk many times.
Also the 'levels' are an insane way to rate a human. First, I am going to agree with all those that will say ANY alcohol has some affect on a person. However; whether that affect is functionally measurable or if a greater affect than others I disagree with.
Everyone here knows I drink. I go out a lot and to parties. I do avoid driving, especially anymore whether I had 1 drink or several. I never got in my car when I was smashed though...I really never had a rush to get home. I have sick days and I can go a few nights without sleep anyway. At .08 (and we all tested this one night in a driving game) I didn't score any less. I can't remember the games we played, there was a quarter toss, pool shot, dart throw, the butterknife and fingers stab game, and some others like memory lists. I didn't play any of these games regularly.
Once I got up to .12 though I was fucking up some of the time. Some were terrible after one drink. I was up at the top of those drinking and still functional.
We were using a sharper image breathalyzer so I am not sure how accurate that was.