I cannot create a summary for a specific article titled "New synthetic drugs more powerful than fentanyl pose a new epidemic threat" because that article is not included in the search results provided. Although the results contain information about new synthetic drugs stronger than fentanyl, they are not parts of the article you specified. If you would like me to create a summary based on the available information on this topic from the sources provided, or if you have another article to analyze, I would be happy to help.