I wish...have to work.
The drug in question its not a generic formulation, which are made by licensed drug manufacturers. There is a loophole in drug manufacturing that allows medications to be formulated outside of the rigorously tested, monitored and licenced facilities that make drugs. This loophole allows what are called compounding pharmacies to make drugs to use in instances where the drug is not available in the form needed, or has to be specially made up for an individual patient. Some (very few) compounding pharmacies sign up for special testing and monitoring. That system is voluntary, though, and few compounders bother - such as the one responsibly for the contaminated medications. They were, by the way, apparently breaking the law by mass-producing instead of formulating for individual patients. No insurance company would require the use of compounded medications, they are intended to be for special circumstances only.