A popular proverb in some circles is the semi-alliterative:

Absence of evidence is not evidence of absence.

This is often recited by those who dearly desire to believe in something --- a nefarious plot, a foreign conspiracy, etc. --- in spite of the total lack of supporting facts or observations.

But as a comrade (DD) points out, absence of evidence is certainly not evidence of presence --- even though True Believers might wish it were so!

(see also WebsOfEvidence (15 Feb 2000), PickyAboutFacts (11 Mar 2003), ...)

TopicThinking - 2003-03-17

(correlates: KiloPixAndMegaWords, WeightOfEvidence, 2008-08-23 - Lost in the Woods GPS Trackfile, ...)