Mold colonies and liquid-flooded air purifiers: CVS sourced medication from tainted factories—and it has twice the amount of recalls on store-brand drugs than competitors
This article in particular is referring to their over-the-counter products. Wherever you get prescription medications, they're almost certainly going to come from one of two suppliers, McKesson or Cardinal.
Prescription medications are kept to a much higher standard, in terms of purity, storage, etc.