Follow the Money.
“These days, of course, medical research is not just a scholarly affair. It is also a global, multibillion-dollar business enterprise, powered by the pharmaceutical and medical-device industries. The ethical problem today is not merely that these corporations have plenty of money to grease the wheels of university research. It’s also that researchers themselves are often given powerful financial incentives to do unethical things: pressure vulnerable subjects to enroll in studies, fudge diagnoses to recruit otherwise ineligible subjects and keep subjects in studies even when they are doing poorly.“