In late 2010, Redflex executives were implicated in a bribery investigation in Chicago, Illinois. Following up on a letter from a whistleblower, the Chicago Tribune reported that a Redflex consultant had been making improper payments to a City of Chicago transportation official, John Bills, who was responsible for overseeing the awarding of contracts for the installation and operation of Chicago's widely hated red light camera system. The consultant, Marty O'Malley, who was a long time friend of Bills hired to oversee the Chicago contract, had received in commissions for the contract which had provided approximately million in revenue for Redflex. A two-year internal investigation conducted by Redflex reported in October 2012 that it had found only one instance of an inappropriate expenditure: a two-star hotel stay at the Days Inn for Bills, paid for by the consultant, who was subsequently sent for anti-bribery training. The Chicago contract is the company's largest in North America. With 384 cameras it provides 13% of Redflex Holdings' worldwide revenue.