Breathalysers

complete waste of money. everyone i stop tells me to shove it.

Yes, they do the job. But tbh I can always tell when I'm going to be over or close to the limit....I was 0.5 10 hours after a massive session the other weekend.

0.8% is the limit but I wouldn't risk higher than 0.3%

can't go wrong for a tenner imo.

http://www.ebay.co.uk/itm/NEW-Police-Digital-Breath-Alcohol-Analyzer-Tester-LCD-Breathalyzer-test-detector-/131345946689?ha****m1e94d41841:g:G9QAAOSwabhUWyAs

i get the feeling that the old "2 pints is ok" rule maybe too low so this may encourage more drinking. anyway for a tenner i'll give it a go

Be very wary. These are probably Chinese imports and can be notoriously inaccurate. They can instil a false sense of security if they read low.
Your protestations will come to nothing when the proper, calibrated machine says "Send him down"!