As the idea of implicit bias has permeated our culture, an entire industry has sprung up, like mushrooms after rain, to conduct trainings meant to raise awareness of the problem and counteract it. But few of the implicit-bias trainings that are now de rigueur have been rigorously evaluated. Many don’t measure their own impact. In fact, many don’t establish concrete goals at all. The approach is akin to whipping up an elixir to treat a disease, and then dispensing it to patients without ever assessing its effects—or even deciding what its effects should be. [...]