From the Tribune:

Ex-building inspector testifies of bribing city worker
By Jeff Coen | Tribune reporter
January 24, 2008
A former building inspector whose undercover cooperation led to federal charges against three city employees in a bribery probe told a jury Wednesday how he passed thousands of dollars in payoffs while wearing a hidden recorder.
David W. Johnson, who had worked for the City of Chicago since 1994, said he agreed to cooperate after being arrested himself for taking bribes to influence zoning and building permits. He testified at the Dirksen U.S. Courthouse in the trial of Darryl Williams, an electrical inspector for the city's Department of Construction and Permits when he was charged last year.
Jurors watched surveillance video of Johnson and Williams meeting in Johnson's SUV in the parking lot of a fast-food restaurant and listened as the men discussed a plan to have Williams expedite a permit in exchange for $8,000.
Johnson showed up with the cash and drawings for a project by Sorin Adrian Oros, a contractor who also was convicted in the probe. Johnson told Assistant U.S. Atty. Juliet Sorensen that he passed the cash to Williams in a bag from the fast-food restaurant at Garfield Boulevard and King Drive.
In a tape played in court, Williams could be heard asking whether Johnson's son was 8 years old. Johnson said that was code for the amount of money he thought was in the bag. "Eventually he's gonna celebrate his 10th birthday," said Williams, allegedly tipping off Johnson that there would be a price increase for his services.
Johnson, 43, said he eventually passed $40,000 in bribes to Williams before his arrest.
The testimony indicated that Williams continued to accept the money even after he knew Johnson had been arrested with Oros in 2006.
In their first call after the arrest, Johnson could be heard telling Williams that it had been a misunderstanding with police who thought the men were involved in a drug deal. Williams accepted the explanation despite telling Johnson he had heard his name was being dropped "left and right."
Williams' attorney, Nathan Diamond-Falk, challenged Johnson's memory of the conversations. Johnson had difficulty recalling when he first started taking bribes and exactly what he had pleaded guilty to in the case, but he told Diamond-Falk that he expects a sentence reduction for helping the government.