Breathalyzers aren't 100 percent accurate, so there is a possibility that you can question the results if you've been accused of drunk driving. Breath tests have to be calibrated correctly and given by trained professionals. In addition to this, those giving a breath sample could receive a false positive if they burp or recently had a drink of alcohol that is still present in the mouth's tissues.
The more time you spend on the road, the greater chance there is that you will eventually drive directly into a DUI checkpoint. This is particularly true if you drive a lot during the evening and nighttime hours.