I bet it's control groups. The FDA thinks similarly. In late 2021, they canceled trials of Paxlovid because it was immoral to have a control group. They did

I bet it's control groups. The FDA thinks similarly. In late 2021, they canceled trials of Paxlovid because it was immoral to have a control group. They did not then _waive the trial requirement_, meaning Paxlovid was both too proven to deny but too unproven to be administered.