When I worked as a Forensic Scientist - many, many years ago - one of my major responsibilities was finding evidence that would either be used to exonerate or prove guilt. However, if I didn't find evidence, that didn't mean that there was no evidence. Perhaps the evidence was thrown away, the correct evidence wasn't collected, the sample that was taken for analysis wasn't the best sample or a multitude of other reasons. As a result, absence of evidence was not evidence of absence.
It recently occurred to