If you are pulled over for suspicion of driving under the influence, you may be aware that you are allowed to refuse to take a breathalyzer test. If you refuse to take a breathalyzer test, you will be charged with refusal to submit to a breathalyzer test and will be subject to additional penalties, including a six month license suspension. The benefit of a refusal to submit is that the police will not be able to introduce chemical evidence of your intoxication.
Many people, however, fail to realize that even the field sobriety test is voluntary. You are under no obligation to submit to a field sobriety test when asked by the police. If you refuse, the police will be forced to make a decision whether to arrest you based on what little evidence that they have observed (i.e. slurred speech, bloodshot eyes, etc.)
Most people will submit to a field sobriety test because a) they think that they have to; or b) they feel that they can pass the test. As to part "A", I have already informed you that you do not have to submit to the test. As for part "B" - DO NOT ASSUME THAT YOU CAN PASS THE TEST!! Even someone who is completely sober or had a single drink can fail a field sobriety test because it is difficult. I know that if I were asked, even without drinking, that I would have a terribly tough time standing on one leg for thirty seconds without wobbling. In addition, the police officer will be making you nervous and this will make it more likely for you to make a mistake.
Furthermore, the field sobriety test is entirely subjective. There is no scientific basis for this test. Instead, police officers are given a number of signals to look for to identify a drunk individual. However, there is no magic number to the amount of mistakes that you can make and still pass the test. If you still do not believe me, ask a police officer friend of yours how many people suspected of drunk driving actually pass the field sobriety test.
Based on the way you were driving your vehicle, or based on your speech patterns and conduct, the police officer may still decide to arrest you if he feels that he has probable cause. However, by giving the police little additional evidence to support the arrest, you will put yourself, and your criminal defense attorney in a better position to win at trial.