Given all the potential biases and mistakes and outright lies the media or eyewitnesses can make, especially now in the age of the internet, how can we reliably determine what has ​actually happened in any given news story or criminal investigation?

Given all the potential biases and mistakes and outright lies the media or eyewitnesses can make, especially now in the age of the internet, how can we reliably determine what has ​actually happened in any given news story or criminal investigation? You must first consider which factors most interfere with our ability to find the “truth” (is it lies and deception and misinformation? Is it human error? Is it incompetent story telling, by reporters and/ or witnesses? Is it personal and political biases? You can decide which exact factors to consider). And then you must devise some way to minimize, if not eliminate, those interfering factors. Whatever you come up with, you must be specific, you must explain yourself, and you must support your point of view at length.