With the rise of DNA evidence, we now know more than ever about how often eyewitnesses make mistakes. It's staggering. A lot of people go to jail because a confident eyewitness makes a mistake in court and picks out the wrong person.
Plea bargains are an interesting part of the justice system in the United States. Typically, it means that you're offered a lesser charge if you decide you will plead guilty to that charge. For instance, you may have been accused of murder, but you could get manslaughter in exchange for a guilty plea.