A Department of Health and Human Services spokesperson called the move "a radical departure from past practices."

Public health experts warn that the change could lead to people getting a placebo shot instead of a necessary vaccine.

Per the Post, which first reported the story, “‘All new vaccines will undergo safety testing in placebo-controlled trials prior to licensure — a radical departure from past practices,’ an HHS spokesperson told The Washington Post in response to questions about Kennedy’s comments on the measles vaccines and general vaccine policy."