HHS Secretary Robert F. Kennedy Jr. is requiring all new vaccines to undergo placebo testing in a new policy change meant to promote greater transparency.

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."

Here are eight possible indicators of how health secretary Robert F. Kennedy Jr. may handle U.S. vaccine policy in coming weeks.