text: My only problems is time. If the programs take an hour or more plus time you can't really act on the problem imediatly. Also the way that people feel changes so fast that if you do ask how they feel they could be just fine by then. Also another problem i could see is can it take one face or a whole class room of faces. If it can take a whole classroom and spit out how each individual felt at that exact moment then we should us them in classes.