text: The final reason why it is valuable is that it can tell if a student it lying or not. It can see if a student is tell the truth by just looking at their face. FACS calculates major muscles in the someones face and exposes if someone is lying and experts say," Faces don't lie". The evidence in the text says that," The process begins when the computer constructs a 3-d comouter model of the face; all major muscles in the model must move like human muscles." This would help teachers with students in the classroom.