do explain how
Due to the nature of human beings who are against a group, or just want blatant justice against someone who killed someone in self-defense or something, these are things you must know: a video camera does not lie, a sound recording does not lie, a DNA sample most likely does not lie. Humans do. Humans can ask favors of others, humans can be bribed.
It can be used to aid in a case, but CANNOT be used alone if you want to prove someone guilty.
source: study a little bit of law and common sense.