Improve Medicare oversight, Miami's U.S. attorney tells Senate

South Florida's reputation as the capital of Medicare fraud came under the congressional spotlight with U.S. Attorney R. Alexander Acosta telling a Senate panel the best tool for fighting scams is tightening oversight at the top. Acosta, who since 2006 has prosecuted more than 700 people responsible for more than $2 billion in fraudulent Medicare billings, told the U.S. Senate Special Committee on Aging that he started focusing on fraud because he was "absolutely disgusted" by the level of scams in South Florida.