The United States Attorney's Office for the Northern District of Illinois, in Chicago, has repeatedly forged cooperative federal-state prosecutions of Medicaid fraud and the Walgreens settlement is just the latest in a string of recent successes.

In 2006, the Chicago U.S. Attorney's Office led efforts which resulted in Omnicare, Inc. paying more than $50 million to settle allegations of Medicaid fraud. The United States worked with the National Association of Medicaid Fraud Control Units ("NAMFCU"), prosecutors in 43 states and the District of Columbia and relator's counsel, Behn & Wyetzner, Chartered, to achieve that recovery.

In 2007, the U.S. Attorney's Office in Chicago worked with prosecutors from the Office of The Attorney General of Illinois and relator's counsel, including Behn & Wyetzner, Chartered, to win one of the largest judgments achieved under the False Claims Act, amounting to $334 million. That case was against Amerigroup Corporation, a Medicaid HMO in Illinois.

In March of 2008, the U.S. Attorney’s Office in Chicago achieved a $37 million settlement with CVS Caremark Corporation to settle allegations of drug switching in CVS pharmacies. The United States worked with prosecutors in 23 states and relator’s counsel, Behn & Wyetzner, Chartered.

Patrick J. Fitzgerald is the United States Attorney for the Northern District of Illinois, and Thomas P. Walsh is Chief of the Office's Civil Division. Assistant United States Attorney ("AUSA") Linda Wawzenski, Deputy Chief of the Civil Division, successfully developed the federal-state prosecutions of Medicaid fraud in the Walgreens, CVS, and Omnicare cases, as well as many others. AUSA Wawzenski teaches prosecutors, investigators, lawyers and healthcare providers throughout the country about joint federal-state Medicaid fraud prosecutions.

The U.S. Attorney's Office is actively assisted by other federal investigative agencies in Chicago, particularly the Federal Bureau of Investigation, the Office of Inspector General of the Department of Health and Human Services, and the Food and Drug Administration. These agents are under the supervision of Daniel R. Levinson, Inspector General, U.S. Department of Health and Human Services; Michael Cleary, Special Agent in Charge of the U.S. Food and Drug Administration, Office of Criminal Investigations, in Chicago; and Robert D. Grant, Special Agent in Charge of the Chicago Office of the Federal Bureau of Investigation.