The cameras that know if you're happy - or a threat

Facial recognition tech is becoming more sophisticated, with some firms claiming it can even read our emotions and detect suspicious behaviour. But what implications does this have for privacy and civil liberties? Facial recognition tech has been around for decades, but it has been progressing in leaps and bounds in recent years due to advances in computing vision and artificial intelligence (AI), tech experts say. It is now being used to identify people at borders, unlock smart phones, spot criminals, and authenticate banking transactions. But some tech firms are claiming it can also assess our emotional state.