Breathalyzer

[Misanthropy]

Aside from perhaps hyperventilating & sucking pure O2, just prior to the exhalation, I don't think there's much defeating a breathalyzer. Interfacing an analyzer with your gas exchange system under closed conditions is a pretty intimate proposition & not easily denied....

Beating the Breathalyzer/Intoxilyzer

[Cosine]

I have seen one method that has worked multiple times. Have you ever seen someone play a didgeridoo? Essentially they are able to inhale air through their nose and simultaneously exhale through their mouth. In a short burst (length of time you have to blow in a breathalyzer) you are able to exhale the fresh air that you are inhaling. It seems impossible but it can be done with a LOT of practice.

A very good method of practicing this is to get a thick straw and submerge one end into a glass of water. Now blow through the other end producing bubbles in the water. Attempt to inhale through your nose as you exhale through you mouth. If you do it right the water bubbles will continue and you wont suck any water up. However, I can't stress enough how difficult this is to achieve and how much practice is required.

Also a word of warning; while you are blowing fresh air out, there will be the presence of some alcohol from your body. However it will be greatly reduced.

[Misanthropy]

In my experience, a breathalyzer required a solid, strong (pressure! Not bubbles in water), consistent exhalation to even function.

I don't think one will get it done like this but if so, I'd love to see it.

[deadlyvenom]

this might be a little off topic but my friend has a gf in atf or whatever the fuck that medic trainging is but anyuways he said there is no real way to beat it if you are smashed but if you anly had a few beers than insist to have your blood drawn then from being nervous and the car ride to the hospital you sober up and pass the test

[Steve_TPF]

I agree with Misanthropy. The breathalyzers in Aust require a hard blow to work - an indicator light tells the cop that you've blown hard enough. The puffing action you get from continuos circular breathing would never be enough to make it work.

Demonstration of circular breathing. This guy shows you how to play a didgeredoo, but note that he only uses the "circular breathing" between full breaths. To beat the machine you would need to circular-breath constantly to avoid using alcohol-laden air from your lungs. Two problems here:

1: Not enough airflow to give the machine a reading.

2: The required cheek-puffing action is a dead giveaway. Even dumb cops will realise you're trying something other than a proper blow.

Unless the breathalyzers in the US are considerably different than the ones in Aust, I don't believe this is going to work.

[Misanthropy]

Mouthwash doesn't work. It's not testing air from your mouth, it's testing air from your lungs, where your blood metabolites interface with the air...