The D.C. Taxicab Commission’s failure to use internal controls when collecting more than $1.1 million in license payments made it possible for employees to steal from the agency, an audit concluded. The audit found that the commission couldn’t account for all of the license payments it received between 2005 and 2008, in part because it did no accurately document and track financial transactions. That’s the same period during which a bribes-for-licenses scheme took hold, authorities say. It was busted in September 2009 by the FBI, which revealed taxicab Commissioner Leon Swain had been working with federal investigators since late 2007. More than 39 people were indicted, including the former chief of staff of Ward 1 Councilman Jim Graham.