You look but do not find: why the absence of evidence can be a useful thing

Some people argue the absence of evidence is not evidence of absence, you just need to keep looking. But there are occasions where finding no evidence is all you can do.
Read more: https://theconversation.com/you-look-but-do-not-find-why-the-absence-of-evidence-can-be-a-useful-thing-114988?source=Snapzu