Unless you are under 21 you have the absolute right to refuse the field sobriety tests. You can only be accused of a refusal if you refuse to submit to the evidential test of either a breath or blood test.
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You can legally refuse to take field sobriety tests (FST's). However, you are mandated to submit to a chemical test if probable cause exists to believe you are driving under the influence. Failure to submit to a chemical test is punishable by license suspension, not necesarily criminal charges. Your question suggests you've been charged with refusing to do FST's. That is not a criminal offense in and if itself....