The placebo effect has an evil twin — and it can be deadly

In late 2022, as the fentanyl drug overdose epidemic raged across America, police officers making street busts of the synthetic opioid began experiencing what they believed were “life-threatening” reactions. In Florida, an officer lost consciousness after touching a powder she thought was fentanyl. She felt “light-headed … I was choking. I couldn’t breathe,” the officer...