Deborah J. Riggs, 55, has had a previous drug conviction and has had her nursing license suspended twice after allegations of stealing controlled substances. In this instance, Riggs is accused of diluting morphine solutions which were intended for five residents of Halstead Health and Rehabilitation Center and faces a 10-count indictment for tampering with a consumer product and adulteration of drugs.

Riggs is scheduled for a change-of-plea hearing on December 13, 2010 in U.S. District Court.