I cannot create a summary of the requested article because the full text of the article titled "Opinion: Former FDA commissioner: HHS leadership is focused on policy-based evidence, not evidence-based policy" is not found in the search results provided. The search results contain only fragments of former FDA Commissioner Robert Califf's statements from various sources, but not the complete article you requested to summarize. In order to create an accurate and factual summary in accordance with your requirements, I would need access to the full text of this particular article.