oluno, just one second, sir. we never saw oluno again. his drug rehab business here in southern california has been part of the largest medicaid program in the nation paid for with federal and state dollars. a one-year investigation by cnn and the center for investigative reporting, found the rehab portion of that program, called drug med-call is rife with fraud, has operators who bill the government for made up clients and often get away with it. joy saw plenty of fraud in the nine years she spent working as a supervisor over at drug medi-cal. >> i believe the word got out that there was easy money to be made in the outpatient drug free system. >> how bad is it? >> it's bad, it's really bad. i left state service about three years ago, and we would have one provider that would bill for over a million dollars in one year, that we believe was 100% questionable billing. >> and that one provider was no isolated instance. over and over, we found examples of fraud. not hidden fraud. this was happening in plain sight. for example, george oluno.

oluno, drew griffin with cnn, how russ?una have -- in original california for the past six years, which is surprising, because for the past 11 years he's been on a list of people banned from billing medicaid. convicted the student loan fraud, he should never have been allowed to even open this clinic called gb medical. you seem to be at the center of fraud allegations here. >> no, no, no. >> reporter: have you been faking signatures on to sheets of paper and billing the state for the money? guess what else? he's facing felony criminal charges for ripping off the state, allegedly getting paid by taxpayers to rehab drug abusers who weren't even there. >> excuse me, sir, how can you bill the state for clients who don't exist? mr. ilouno? just one second, sir? we never saw ilouno again. the business here in southern california has been part of the largest medicaid program in the nation, paid for with federal and state dollars. a one-year investigation by cnn and the center for investigative reporting found the rehab portion of