To several U.S. senators, it looked wasteful, even outrageous. Every year, taxpayers pay for at least $750 million worth of expensive pharmaceuticals that are simply thrown away. Companies ship many of the drugs in "Costco"-size vials, one lawmaker said, that once opened usually cannot be resealed or saved for other patients. Yet pharma gets paid for every drop.

So Congress turned to the prestigious National Academies of Sciences, Engineering and Medicine for advice, given its reputation for "independent, objective reports" on such matters. The national academies' influential report, released in February, struck physicians who've tracked the issue as distinctly friendly to Big Pharma. It advised against an effort to recoup millions for the discarded drugs. It concluded that Medicare should stop tracking the cost of the drug waste altogether.