A murder has occurred. We’ve heard about it on our local television news or read about it on the Internet. The police have arrested someone in connection with this deed, and the world seems a safer place because there is a dangerous person off the street, away from our friends and family members. By all accounts, th person arrested appears to be guilty because there is a short video of the act which they are accused of committing. It was happenstance. Someone with a smartphone happened to record the exact moment when the murder happened. It’s a slam-dunk case for prosecutors.