I was told something similar even for a simple DUI. Better to lose your license (virtually guaranteed if you refuse the breathalyzer) and get whatever moving violation they pulled you for (or maybe it’s just a tail light or whatever.
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and the cops will likely compel you to take a blood test at the hospital. But, the amount of time it takes to draw your blood will help lower your BAL, and that will help you in the criminal trial AND any civil suits.