While my advice here is absolutely not to get behind the wheel if you've been drinking, the reality is people do drive after they have been drinking. (I don't say this in a judgmental way, it's just I see how unfair the system is in the sense that even sober people can fail a field sobriety test. When you couple that with the fact that even if you blow UNDER the limit, you are still going to jail, I just want to warn people to not take that chance if at all possible.)...Now, contrary to what might seem logical, driving after drinking IS NOT illegal. If that were so, why in the world would there be parking lots outside of every bar, restaurant, or establishment that serves alcohol to people that surely drove themselves there? So drinking and then driving is not what is illegal. What makes it illegal is when a person is driving under the influence (whether it be alcohol or drugs) TO THE POINT that it impairs their "normal faculties", in other words ability to drive at a "normal" level. Without getting into that here, the question I get asked many times is if an officer orders you to take a breath test, should I blow?