While George Shirakawa Jr. bides his time behind bars after admitting to filching public money, the price of defending him in court keeps ticking up as a second criminal case moves forward. By the latest count, the erstwhile county supervisor’s attorney has cost taxpayers $15,950.54 for work completed through February, according to the Indigent Legal Defense Office. We can add that to that the $3 million the county already spent on audits and a couple special elections to sop up the mess Shirakawa made. But with the trial date in his political mail fraud case pushed back to September, we can expect this tally to keep growing. County rules dictate his taxpayer-provided defense attorney, Jay Rorty, can charge no more than $110 an hour. But since Shirakawa’s suspected of licking stamps affixed to political mailers, his defense could significantly increase next month. Rorty has hired renowned DNA and change-of-venue experts to weigh in on the trial.