Many people do not know that they have the right to refuse to perform the so-called "field sobriety tests", and the refusal cannot be mentioned to the jury. The "tests" are neither fair nor accurate; the police are attempting to obtain incriminating evidence, and the decision to arrest may have already been made. I recommend performing these tasks only if you are extremely confident regarding your ability to understand the instructions and to perform fairly complex, strange and new exercises under a great deal of pressure. If you are arrested, the more difficult question is whether to take the breath test, because there is a 180-day license suspension if you refuse (one year if this is your second offense); if you take the test and blow over .08 (.02 if you are under 21), your license will be suspended for up to 90 days, but that suspension ends when the court case is resolved. If you are the type of person who is likely not to fight the case in court, you should probably take the test. If you want the best chance to "beat" the case in court and can live with the license loss, it is best to decline the test unless you have consumed very little alcohol.