Ok I'll tell a story about how I beat the system on a DUI.
I was being a dumb 21 year old, drinking my arse off, totally wasted. I didn't want to drive anywhere but a friend of mine was begging me to drive him home. Being that I was drunk and stupid, I decided to drive him. Well I got pulled over for a tail light violation. I played it cool and the cop wrote me a ticket. Right before he let me go, he looked at me and said "I smell alcohol, who has been drinking in this car?". I said that I wasn't drinking and my buddy said that he wasn't either (because he was 20 at the time).
So then the cop asked me if I was willing to do a sobriety test. I said "sure". So he did the test where he asks me to follow his finger.
(Before I go on, let me explain a memory that stuck with me when I was in a DARE class for school. My teacher explained to the class that cops can tell how drunk you are with the finger test because when you try to focus on something under the influence, you see double and your eye vibrates. A trained cop can actually tell how drunk you are by how much your eye vibrates. I never forgot that bit of information...)
So... In a stroke of clutch genius, during the entire test, I never focused my vision on a single thing. When he would put his finger in front of me, I blank stared in front of myself, never focusing on his finger. When he moved to the left, I blank stared to the left. Etc... Long story short, I passed the DUI test wasted because I outsmarted the system.
I am not even joking when I say that ANYONE can pass the finger test as long as they do not focus on the finger (valuable info here). I learned my lesson though and I have never driven under the influence again after that day.