Don't know how it works in the States but in Canada if you don't provide a breath sample when required to do so, you're subject to the same penalties as if you were proven to be impaired. And the breathalyser sample is not the only legal proof of impaired driving, just the most technical & quantifiable one.

Don't know how to get a falsely low reading, but there are lots of ways to get a false high one. Take a swig of mouthwash, for example. Or if you have just one beer and then provide a breath sample a few minutes later, it will probably be high. (That's why they take you down to the station and do a second sample within an hour or so if you blow a positive on the roadside test.)

Best way of course is to avoid getting into that situation where you see the flashing red lights and go "oh shit".

Now that I don't drink, I enjoy the drive home after a night out a lot more.

Willie-O
wasn't always a good boy, but never got caught...
call me lucky.