Bible

Sometimes, absence of evidence for p does not count as evidence for not-p. So, there being an absence of evidence for, say, that there are 1.2 billion ants in Jerusalem does not count as evidence that there are not 1.2 billion ants in Jerusalem. At other times, however, absence of evidence for p does count as evidence for not-p. So, that there are no signs of footprints in the mud is not only an absence of evidence that somebody has just recently walked in the mud, but is evidence that nobody has walked there.