text: In comparison, others might say FACS technology should be used on people. You would be able to find the truth on how someone actually feels about something. In a false smile, the mouth is stretched sideways using the zygomatic major and a different muscule, the risorius. To an expert, faces don't lie. For example, when a dictator says he treats his citizens fairly, we can use the FACS technology to find out how he really treats them, or to spot when a "smiling" politician or celebrity isn't being truthful.