You are not legally required to take a field sobriety test. This is unlike the chemical tests to determine your blood alcohol concentration [BAC]. When asked to take a chemical test, by a police officer who has already arrested you, if you refuse there are serious consequences, i.e., loss of drivers license for a year. I would recommend that you respectfully decline to take the field sobriety test. Remember, always be polite and courteous to the officer. If you are rude or become abusive or obstructive, the only person who is going to lose is you, not the police officer. You can certainly refuse the field sobriety tests in a polite and courteous manner.