A new law in California protects consumers’ brain data. Some think it doesn’t go far enough.

On September 28, California became the second US state to officially recognize the importance of mental privacy in state law. That pink, jelly-like, throbbing mass under your skull—a.k.a. your brain—contains all your thoughts, memories, and ideas. It controls your feelings and actions. Measuring brain activity can reveal a lot about a person—and that’s why neural data needs to be protected.

Regular Checkup readers will be familiar with some of the burgeoning uses of “mind-reading” technologies. We can track brain activity with all sorts of devices, some of which measure brain waves while others track electrical activity or blood flow. Scientists have been able to translate this data into signals to help paralyzed people move their limbs or even communicate by thought alone.