After the owner of a suburban Chicago driving school was convicted of bribing state examiners to pass his students, 470 Illinois licensed drivers were ordered to retake their road tests this fall. The conviction and its fallout are the latest results of a year-and-a-half federal investigation into accusations that while Gov. George Ryan was Illinois secretary of state, officials under him sold driver’s licenses for political contributions. Ryan has not been implicated in the inquiry, but earlier this year, Dean Bauer, who was inspector general under Ryan while he was secretary of state, was indicted on federal racketeering charges, accused of trying to cover up investigations of wrongdoings in the office to protect Ryan from embarrassment. Thirty-eight people have been indicted in the inquiry, with 32 convicted. The investigation has involved workers in the secretary of state’s office and the license office and driving schools. Dave Druker, a spokesman for Secretary of State Jesse White, said that 218 of the 295 drivers who had retaken the driver’s test failed this fall. An additional 175 did not show up to be re-examined, and their licenses were canceled. Bharat Patel, owner of the New Delhi Driving School, now closed, in Chicago, was sentenced to 37 months in prison after being convicted of paying bribes of $10 to $50 to state examiners from December 1997 to November 1999. Eight licensing examiners from the state licensing office on the west side of Chicago have pleaded guilty. Officials say they doubt the students knew about the bribes. White’s office, which has ordered that all drivers who obtained licenses under questionable conditions be retested, may have to test 10,000 people, Druker said.