Woah, wait a minute, That seems kinda..... odd. If they are caught in the act of a crime, then there would be no need for a confession. Depending on how they were caught, by credible eyewitness or video survelliance, there would be evidence proving beyond a reasonable doubt that they are guilty. They have the right to remain silent. No confession would be required. The overwhelming evidence would be enough to convince a jury of their peers of their guilt. And also, the amount of jailtime would not be decided by their confessions just like that, they would still need to be convicted and sentenced by a court of law. It also depends on the magnitude of their crimes. Would you lock someone up for ten years because of petty theft?