but don haviland thinks he knows why they didn't fight for a lower price. >> haviland: in a word, the money. it's all about the money. they obviously have a divided loyalty. >> bach: express scripts is a big corporation. it also has parts of it that make money when drugs cost more, and when more expensive drugs are sold. >> stahl: whoa. wait, wait, wait, wait! ( laughs ) you're saying that this p.b.m., whose function is to keep drugs' prices low, makes money when drug prices are high? is that what you've just said? >> bach: yes. so, express scripts is many companies, not just the p.b.m. it also owns a pharmacy that sells expensive drugs. it also owns a company that ships and packs expensive drugs. all of those other parts of express scripts corporation make more money the more acthar goes out the door, the more prescriptions for acthar are filled and refilled. >> stahl: the city of rockford was able to find out one more piece of the puzzle-- that express scripts, the company it hired to keep prices down, also had a contract to be the exclusive distributor of acthar. rockford's lawyer,