Jonathan Frieman contested his citation in Marin County Superior Court on January 7th, 2013, stating that, because California's Vehicle Code defines a "person" to not only mean "natural persons" and "corporations," he was was legally qualified to drive in the HOV lane. His reasoning was that there were two persons (as defined by state law) in the car at the time. This was all a part of Frieman's plan--he had been purposefully driving in the carpool lane with a corporation as a passenger for 10 years. He'd never been caught because enforcement is so lax.
Nevertheless, Frieman was still handed a "guilty" verdict and instructed to pay his $478 fine. Instead, he chose to appeal the Traffic Court's decision to Marin's Superior Court. Frieman and his attorney Ford Greene appealed the verdict to the Marin County Superior Court. In August of 2013, Judge Verna Adams denied the appeal. That decision will be posted as soon as Frieman figures out how to do that on this web site.
He appealed Adams' decision to the next level up, the California Court of Appeals. The Court also denied the appeal, with no reason given. Without funds, the case was dropped. To this day Frieman still drives in the carpool lane during restricted hours with incorporation papers on his cell phone.
Essentially this is the summary of the case argument.