What is proof but just another way to increase the likelyhood of an event? Got a DNA match on a murder scene? Sadly a match isn't unique and several people can

What is proof but just another way to increase the likelyhood of an event? Got a DNA match on a murder scene? Sadly a match isn't unique and several people can be matched. Got your suspect caught on the crime scene? Might've just been at the wrong place at the wrong time. A cop caught the suspect murdering? The cop might be the guilty one and just trying to frame an innocent. This kind of statistic is as good as proof, proof isn't 100% reliable either.