Couple of points.

1. Many police departments are purchasing a special flashlight alcohol sensor - so when it is close to your face it will give an alcohol reading. Its being used as another aid to detect drinking drivers and I think its a great idea.

2. In Canada even though there is a legal limit, it is up to the police officers discretion whether you may drive or not in fact you may be issued with a one day drivers license suspension even if you are below the limit or even without taking a breathalyzer. (also a great idea)

In fact I myself received a one day suspension when after a party I decided that I had too much to drink and after driving a few blocks pulled over to sleep it off in the car. At 4 am there was a knock on my window (Id forgotten to turn the parking lights off) The police gave me the suspension (even though I wasnt driving) and without any breathalyzer. I had an expensive cab ride home and lost my license for a day.

I agree this is a serious topic but here is one case of how to beat the breathalizer. Based on an actual case in Czechoslovakia, collected by a lawyer turned folksinger.

A family drove to a wedding reception in the country and of course there was a bit of drinking too much. At one point in the party a couple of children (around 8 yrs) snuck off with some liquor to the barn, Of course their parents later found them quite sloshed. On the drive home the father of one of the kids found himself at a roadblock and because he'd had too much to drink became quite worried. When the police officer asked him to blow in to the balloon which turned colour indicating alcohol, the father quickly suggested, 'theres got to be something wrong with that, look try it on the kid in the back, everyone knows kids dont drink. They did and now the police were surprised and figured that indeed something was wrong with the breathalyzer and waved them on.

If youre going to drink and drive make sure you have a car.