Munge is absolutely right...there is a lot of bad legal advice given here. That is why I'm not trying to give you legal advice, just some information and a couple of friendly personal suggestions. I try not to be a straw lawyer, but I am a DWI judge for a living.
A bit of research shows SC to be like many states. You can be found guilty in either of two ways: 1) substantial impairment, or 2) registering .08 or greater. Since you only blew .03, they'll have to prove the former. In some states, a result of .03 can be used to create a presumption that the person was NOT impaired, but I don't know about SC. Your lawyer will tell you about that. Also, SC has some strict laws about videotaping incidents such as this. Most states (like mine) make it optional, but I believe SC makes it absolutely mandatory, so there would be something more there than your word against his as to how you performed on your tests, etc.
Based purely on what you have said, it sounds like an interesting case. Keep us posted.
And again, not trying to speak for Munge, but I think he was stating an opinion in your best interest. People do get some really lousy advice here.