(From Expierence) NEVER BLOW!!!!!! It is the officers job to prove, beyond a reasonable doubt, that you were intoxicated.
Ive been pulled over before... I knew I could pass the "Physical" test... Walking the line, following his finger, etc. and I passed these tests flawlessly, luckily it was on video too, then when he asked me to blow I refused.
He threatened me and said not blowing is automatic admission to blah blah blah... I still refused and was arrested..... Spent 8 hours in the jail....
4 weeks later at court, i plead not guilty, asked to see the video tape, which they showed me and the judge.... and was let off with no problem....
NEVER BLOW Let the cops do their jobs