Worse, the cardinal rule of the Pill Model is: Don’t change the pill in the middle of a test. Even if you’ve had an epiphany—Aha! A different formulation of this pill would be much better!—you can’t replace people’s supply with the new-and-improved version, because then you’ve confounded the whole experiment. So, in South Carolina, nurses are essentially forbidden from learning/improving/innovating during the six-year span of the trial.
