Ross Ulbricht, who stands accused of running the Silk Road black market under the name Dread Pirate Roberts, says that new federal bitcoin laws make the charges against him invalid. In a filing over the weekend, Ulbrichts lawyers defended him against charges of hacking, narcotics trafficking, operating a criminal conspiracy, and money laundering. Ulbrichts defense against the first three charges largely amounts to an abdication of responsibility over what users did on the site: any actual drug trafficking would have been done by users of Silk Road, not the sites operator.