The police would certainly use their own certified and more accurate breathalyser system for a court case. I doubt that they could prosecute you using your own equipment, which for all they know, you could have tampered with.
The only logical use I can think of having a portable alcohol device is that when you have a drink, you can check if you are still under the limit. If so, you can have a 'top up' drink until you reach the driving alcohol limit  .
i.e. there is no sensible logic in this legislation. It is more likely to cause harm than good by encouraging drivers to 'top up' before driving. That has always been the argument against them in the UK.
But of course it's an election year for Sarkozy so all sorts of weird and wonderful legislation seems to be being rushed through to bolster support from minority ethnic and pressure groups.
Grey Beard
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