Can I get charged with DUI if I passed 2 out of 3 field sobriety tests?

I was stopped for speeding in a school zone. Officer smelled marijuana on me. I admitted to hitting a bowl two hours prior to the stop. He confiscated half-smoked bowl and a grinder with less than a gram of weed inside. He gave me three field sobriety tests and said I was "borderline". Then arrested me where I refused a blood test. The ticket clearly shows that I passed two of the three tests. Is there any way to get out of the DUI?