So, here's how you can fail a DUI test, even if you're completely sober. If, for example, they give you a test where you raise one foot about 6 in off the ground and you stand there and count to 30. Now, they're timing you while you're counting. So, they're observing several things that you don't know what they're looking for. But as you take this test, if you know, for example, I'm going to go to jail if I put my foot down. So, you don't want to go to jail. So, you do the tightroppe thing and you balance yourself. Well, the cop just counted two points off because you swayed and you raised your arms. You didn't know he was even looking at that. You have the right to refuse the field sobriety test, but most people won't do that. Most people are raised in a society where they've been taught to go along to get along, cooperate with the police, and do whatever the police officer tells you to do. There's no way you pass these tests. Always refuse.