A state official ordered the retesting of as many as 3,000 truck drivers amid a federal investigation of alleged payoffs at driver's license testing facilities.

Secretary of State George Ryan's order Tuesday affects people who went to five Chicago-area testing offices in the past year to receive learners' permits that allow them to get behind the wheels of commercial trucks.So far, five people have been arrested on extortion conspiracy charges, all involving the secretary of state's driver's license facility in Melrose Park, a Chicago suburb. It is one of the five offices where drivers will be retested.

Three current or former employees at the office were accused earlier this month of accepting payoffs in exchange for licenses or permits. This week, a worker at a driving school and a worker at a truck repair shop were accused of agreeing to pay bribes to one of the Melrose Park workers.