Fentanyl is a synthetic opioid that’s 50-100 times stronger than the pain reliever morphine. While some people use fentanyl on purpose, many others get it in their systems without their knowledge.

California is making fentanyl test strips free to organizations. How to get a kit A test strip shows that the heroin sampled is positive for fentanyl. There are two kinds of fentanyl, pharmaceutical ...