By now, we are used to the fact that facial recognition technology allows our phones to identify us—and allows us to see our email, do our banking, order food and hail a ride service. Some of us have even experienced the eerie sensation of Amazon’s Alexa sympathetically informing us that we sound stressed, sad or angry. But the pace of change is picking up. AI facial and voice recognition technologies can do more, faster. For those new lawyers and law student readers, take note: Privacy law is a growth field.

Two emerging technologies are adding to existing capabilities in facial recognition that provide significant safety and security enhancements along with complex privacy law issues: deployment of real-time facial recognition technologies into police body cams (and other security cameras), and emotion detection tools that purport to identify a person’s state of mind.