i know the feeling, i was pulled over one night (on my p's) after i had been drinking earlier on in the night and had been on water for quite a while, i was very very sober!!! but the cops followed me down the road, turn their lights on and pulled me over. it was my first ever breathalyser and i kept stufing it up, the cop got really agro with me, i was doing exactly what he told me to do but i didn't work... then i decided i would do it my own way and it worked... i was like .003 under the p plater limit.... soooooo lucky!!!