>> kirk ogrosky: i think it's way bigger. >> kroft: what changed? >> ogrosky: the criminals changed. >> waterman: sophistication. >> ogrosky: they've figured out that, rather than stealing $100,000 or $200,000, they can steal $100 million. we have seen cases in the last six, eight months that involve a couple of guys that, if they weren't stealing from medicare, might be stealing your car. >> waterman: you know, we were the king of the drugs in the '80s. we're king of healthcare fraud in the '90s and the 2000s. >> kroft: but it's not just miami. in march, the fbi arrested 53 people in detroit, including a number of doctors, and charged them with billing medicare more than $50 million for unnecessary medical procedures. and in los angeles, the city of angels medical center recruited homeless people off the street to fill their empty beds, offering them cash and drugs, plus clean sheets and three squares a day, while billing medicare tens of millions of dollars for their stay. >> eric holder: we have to understand this is a major fraud area. >> kroft: