A new study in Addiction of 637,461 Kaiser Permanente Northern California adolescents found new cannabis use disorder diagnoses fell ~6% per year before California's 2016 legalization vote and rose ~8% per year after, with the reversal starting at passage rather than at retail launch. By early 2020 diagnoses had returned to 2014 levels. The authors argue disorder-level outcomes should be tracked alongside use prevalence when assessing legalization's public health effects.

An NIH-funded scientific team has shown that a new brain-computer interface (BCI) can allow people with vocal tract and bodily paralysis to convey both speech and upper-body gestures simultaneously. While BCIs have facilitated one or the other in the past, this new system is the first to enable both modes of communication at once, more closely replicating natural expression.