The famous 20th century comedian Groucho Marx once said “Who are you going to believe? Me, or your own eyes?” Groucho meant it as a joke, but it is no joke for 77,000 people who eyewitnesses identify as criminals every year in the U.S. The fact is that eyewitnesses frequently mistakes. eyewitnesses often cannot see the criminals clearly because of bad light, the criminal’s clothes or the distance from the crime. When eyewitness do have a good view, they are often too shocked to look at the criminal’s appearance and concentrate on the weapon instead. To make matters Worse, studies have shown that people find it more difficult to remember the appearance of people from another race. At least eyewitnesses usually choose the right person in police lineup, but they almost always pick someone even if the criminal is not present. In spite of all the problems, judges and juries are often convinced by eyewitnesses. In one case in Virginia, police could not prove that the defendant was even in the same city when the crime was committed, but a very confident eyewitnesses testified against him at trail. The man was found guilty and spent 11 years in prison before DNA evidence finally cleared him. In recent year, DNA evidence has cleared more than 125 people. But how many other innocent people are behind bars today because people believed their own eyes?